English Grammar: MUST & HAVE TO

913,899 views ・ 2018-08-21

English with Ronnie


Please double-click on the English subtitles below to play the video.

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You must watch this lesson.
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You just have to watch this lesson.
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It's really important, because it'll help you, and it's confusing in English.
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Actually, you don't have to watch this lesson, if you don't want to; it's your choice, but
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you've already clicked on it, so let's continue.
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I'm going to explain to you two modal verbs that are really confusing in English because
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the positive and the negative have different meanings.
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Let's start with the first one and the easiest one.
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You guys have learned this, I'm sure before, if you studied grammar; or if you haven't
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studied grammar, you guys maybe have even heard about this.
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It's confusing.
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So, what I'm going to teach you today is the difference between the modals: "must" and
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"have to".
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In the positive, "must" and "have to" have the exact same meaning or the exact same function.
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When we use this grammar...
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It's grammar.
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When we use this grammar, "must" you can think about it like a law or a rule.
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Okay?
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Something that is very, very, very important; basically, if you don't do it, there will
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be bad things that will happen.
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So: "must" and "have to" we both use for very strong rules or laws.
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So, I want you to think about in your daily life.
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Or I'll give you an example of travelling.
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So you're going to get on an airplane, so you go to the airport.
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What are some things you must have to get on the airplane?
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One, you must have-or you have to have-an airplane ticket.
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If you don't have an airplane ticket, you're not going to get on that airplane, so you
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buy one.
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The second thing that you must have-or you have to have-is a passport or some kind of
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legal ID; depending on where you are travelling to.
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If you're flying internationally to a different country, you definitely have to have-or must
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have-a passport.
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It's important to have money.
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You must have some money, or you have to have some money.
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How are you going to live?
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How are you...?
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You got money.
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Okay.
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So: "must" and "have to" in the positive form are exactly the same.
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I don't care what anyone else has told you before; I don't care what your grammar books
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tell you; I don't care what your mom tells you - "must" and "have to" in the positive
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are completely equal.
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We don't make a difference.
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You have to do this or you must do this - the ending is the same.
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It's a rule or a law; if you don't do it, there's going to be some problems or you just
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won't be accepted.
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Can you think of an example in your life that you have rule or a law that you must or have
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to do?
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Good.
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Okay.
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Let's look at also the grammar of "have to".
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So, "must" is very easy.
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It's going to be subject plus "must" plus your base verb.
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This is called a modal verb, which is "must".
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So, for example: Subject plus "must" plus your base verb.
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"I must have a ticket to get on that airplane."
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If I don't have a ticket, I can't get on the airplane.
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But when we use "have to", we have to be very, very careful or we must be careful with our
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subject and our verb agreement.
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So, if you have: "He", "She" or "It", we have to say: "has to"; but if you use: "I", "We",
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"They", or "You", we have to say or we must say: "have to".
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So: "It has to be great.", "We have to go now; it's very important."
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So, be careful with our grammar.
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The "must" one is easier.
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So, if you're deciding on which one you like better - choose "must" because you don't have
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to worry about the subject and the verb agreement.
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But again, they are not different.
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"Must" and "have to" are exactly the same.
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The structure is different, but the function or the way we use it is exactly the same.
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You choose which one you like the most.
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The negative of "must not" is basically telling us a rule in the negative.
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For example, you can say: "On the airplane, you must not smoke."
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This is a very, very strict law or rule on any airplane in any country of the world that
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smoking is prohibited; you can't do it.
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If you do it, you will get arrested which means you'll go to jail.
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I don't know if you go to jail, but definitely the police will come and you have to pay a
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lot of money, so don't do it.
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"Must not" we can shorten to: "mustn't".
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You mustn't cough during recording because it makes a loud noise.
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But when we say this, the "t" is silent; we do not say: "mustn't".
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You mustn't pronounce the "t".
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You...
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When we do this, the "t" is actually silent, we say...
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So, we say: "musn't".
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So, I can say: "You mustn't smoke on an airplane", or: "You must not smoke on the airplane."
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Again, they're the same.
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"Mustn't", faster and sounds more natural, but if you want to say: "must not", it sounds
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even stronger.
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So, if you really want to enforce something or tell someone strongly: "Oh, you must not
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do that!
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That's bad!
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Bad, kitten!"
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Is there a kitten?
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Where's a kitten?
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So: "must not" has the same function as "must".
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You're talking about a very strong rule or a very strong law.
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Now, this is where we get really confused because the negative of "have to", if you
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guys look at this, is: "doesn't have to" with: "He", "She", "It"; and "don't have to" with:
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"I", "You", "We", and "They".
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So, rule number one: When you have "have to" you have to be careful-or you must be careful-of
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the function and of the structure, because the structure is crazy.
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If you use negative, we do not change the verb here; we use the auxiliary verb "doesn't"
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and "don't", but you keep the verb.
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You cannot say; you must not say because it's a rule: "She/He/It doesn't has".
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"Doesn't has" is wrong.
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You have to use: "doesn't have to".
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Okay?
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So be very careful with these ones.
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"Doesn't" and "don't" are the verbs that are going to change in this grammar.
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So confusing; just use this one.
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But, again, as I told you, the function is different.
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Okay?
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Also, remember: Every time you learn new grammar or you learn a new thing in English, please
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try and think about: "What's the function?
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Why do I have to learn this stupid grammar point?
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How can I use this in real life?"
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That's what you should always be asking yourself in your classroom, if you're studying by yourself,
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if you're speaking, go: "Why?
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Why?
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Why?
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Why?
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Why?
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Why don't I say: 'She doesn't have to smoke on the airplane'?
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Why can't I say that?"
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The difference is: This kind of grammar, it's very different from a rule or a law.
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This kind of...
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Drama.
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This kind of grammar, it's basically-and this is fun-it's your choice.
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Oh.
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It's your option.
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If you want to, you can; but you don't have to.
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So you have the option to do something.
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Oops.
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Another thing that you will understand from this is that people will give you their opinion
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or their advice; and when we give someone's opinion or advice, they're also going to use
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this structure.
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So, this one is a very strong rule or law; this one is not a strong rule or a law - this
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is your choice or your option, or usually someone's opinion or advice.
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So, let's say that you're getting ready to travel and your mom says: "Hey.
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You don't have to call me every day", but you should.
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Or your friend says: "You know, it's okay; you don't have to buy me a souvenir or a gift
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when you go to this new country", but I'd like it a lot.
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This is someone's opinion.
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You don't have to do it; nobody's holding a gun to your head, saying: "Buy your friend
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a gift in this over-priced souvenir store", and your mother...
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Mom, thanks for all the advice.
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Advice is something that, again, is someone's opinion; it's never a law, unless it's from
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your mom.
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I'm joking.
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Advice and opinion are the same, so it's what people recommend.
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But you have to understand that if you don't want to, you don't have to.
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When you get on that airplane, there are some rules that you must follow.
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You must do up your seatbelt.
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Okay?
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This is a rule and a law.
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You must turn off your cellphone.
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But when the food comes down the aisle and you go: "Wow, that smells great", guess what?
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You do not have to eat that terrible airplane food.
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It's your choice.
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If you want to, you can eat that chicken or beef; but she doesn't have to.
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She doesn't have to eat it, if she doesn't want to; it's her choice.
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When you go to the airport and you're shopping - hey, guess what?
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You don't have to buy that bag; it's not important.
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But you want to, so that's your choice.
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"Oh, I want to buy the bag!"
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But you don't have to; it's not a rule.
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When you...
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If you come to Canada, you don't have to drink maple syrup.
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Well, we don't drink it.
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You don't have to try maple syrup.
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Hey, if you don't want to try maple syrup, that's your choice.
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You don't have to do it, but you should; it's fun.
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I want you to think about things that you have encountered - maybe at your work or maybe
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when you're travelling, or anytime in your life, maybe at your house - things that you
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have made a choice to not do; things that your mother tells you that you don't have
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to do, but you should.
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You don't have to donate money, but you should; it's a great idea.
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You must follow me on YouTube.
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You must not write bad things.
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You have to continue learning English.
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Hey, but guess what?
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You don't have to, if you don't want to; it's your choice; it's my opinion.
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Until then, bye-bye.
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