Advanced English Grammar Made Easy | "I Know" & "I DO Know" Explained in 15 Minutes

What's the difference between I know  the answer, I do know the answer. Well,  

they're both correct, but grammatically they're  

different. I know the answer. Is the  present simple? I do know the answer.

Is the emphatic form of the present simple?  Today you'll learn everything you need to  

know about the emphatic form. Welcome back to  JForrest English, of course I'm Jennifer. Now  

let's get started. Let's review our sentence  again. I know the answer. Of course this is  

the present symbol. The structure is subject  base verb plus S or ES, and this is used for.

states and routines, you know that, right?  Now let's review. I do know the answer.  

This is the emphatic form of the present symbol.  So this sentence is still the present simple,  

but the emphatic form. The structure is  different. The structure is subject plus  

do or does conjugated with  the subject plus base verb.

Now the emphatic form is used to add strong  emphasis to show surprise or contradiction,  

or to confirm or insist that something is true,  

especially if someone doubts it. Now don't  worry about taking these notes because I  

summarize everything in a free less PDF.  You can find the link in the description.

Now let's review an example where you would use  the emphatic form to add strong emphasis. I could  

say to you, you've been studying for hours.  You do know the answer, so I'm emphasizing.

That fact. You do know, you do know. Now,  

let's review an example to show  surprise or contradiction. I could say,  

oh wow, you do know the answer. I'm  impressed, or I'm surprised, perhaps.

And to confirm or insist that something  is true, especially if someone doubts it,  

this is a very common time to use the emphatic  form. I could say you don't have to believe me,  

but I do know the answer, so  I'm insisting this is true.

Now just know grammatically  the present simple is always  

correct and can be used instead of the  emphatic form. So every example I give  

you in this lesson, you can replace  the emphatic form with the present.

Simple, but there is a subtle  difference in meaning between  

the present simple and the emphatic form.  If I say you've been studying for hours,  

you know the answer in the present  simple, I'm stating a fact. If I say  

you've been studying for hours, you do  know the answer. I'm emphasizing a fact.

Or same thing. Oh wow, you know the answer.  I'm impressed again stating a fact. Oh wow,  

you do know the answer. I'm impressed, stating  a fact while also showing surprise or that I  

thought you wouldn't know the answer and that's  the subtle but important difference. Or again,  

you don't have to believe me, but  I know the answer, stating a fact.

You don't have to believe me, but I do  know the answer. I'm stating that fact  

strongly to emphasize it in the face of  doubt. Remember, you're doubting me. Now  

so far all my examples used the verb no, but  any verb can be formed into the emphatic form.

Let's review some examples. I do go  there. I, I do go to bed pretty early.  

I do live in Canada. I do like pizza.  I do write emails every day. I do cook  

dinner sometimes. But when I do cook,  you know, I'm following a recipe. I do.

Fix my bicycle when it breaks. I do jump over  fences. I do cry during sad movies. That's  

true. I do dream big. I do die for coffee, so any  verb you can think of can be used emphatically.

But just know, only use the emphatic  form if you're adding a strong emphasis,  

showing surprise or contradiction, or confirming  that something is true in the face of doubt.  

Use the present simple if you're simply  stating a fact. So if you just ask me,  

oh Jennifer, where do you live? I would reply  and say, I live in Canada. I'm stating a fact.

If you say Jennifer, where do you live? and  I say I do live in Canada, it sounds awkward  

because there's no reason to emphasize this,  but if you say to me you don't live in Canada,  

well now I can emphasize that something is  true and say no no no I do live in Canada.

I do live in Nashville, Tennessee.  I think everybody knows that.

So far all the examples have used.

The subject I, but remember in the  emphatic form, you need to use do does  

based on the subject. I do love pizza.  You do love pizza. He does love pizza.  

She does love pizza. It the dog does  love pizza. We do love pizza. They do.

pizza. So of course the same rules as the  present simple you use do with I you we they  

does he she it third person singular. You  already know that it's the same rule as the  

present simple. So now you know the difference  between I know the answer. I do know the answer.  

What about these two sentences? I knew  the answer. I did know the answer.

Well, I knew the answer. Of course this is the  past simple. I didn't know the answer. This is,  

yes, you got it, the emphatic  form of the past, simple.

So if you say I knew the answer, of course this  is the pasty. We have subject plus past verb,  

and this is used of course for completed past  actions. If you say I did know the answer,  

this is the emphatic form of the  pasty. The structure is different,  

subject plus did for all subjects plus base verb.

And this is used for the same reasons as the  present symbol. It's used to add strong emphasis  

in the past to show surprise or contradiction  in the past or to confirm or insist something  

was true in the past, especially if someone  doubts it. So the exact same reasons why is  

just the difference in structure between the  present and the past. So let's review some.

Realistic sentences. I can say, Yes, you  lifted 50 pound weights. See? You did

improve. I think you really  did improve night over night.

So I'm using the emphatic pasty to add emphasis  to a fact. The fact would simply be, see,  

you improved. That's the pasty to state a fact.

Or I could say, you did call him. I thought you  forgot. So I'm showing surprise or contradiction.  

Honey, you did call him back because it's, it's  really old. If I simply say you called him,  

I thought you forgot. I'm stating  a fact in the past, of course.

Or if I say I did send the report on time, I'm  confirming or insisting that something was true  

remember the past, especially if someone  doubts me maybe my coworker or my boss even  

but if I say I sent the report on time,  I'm just stating a fact about a complete.

Needed past action. Remember that  in the past simple emphatic form  

all subjects use the same structure so it's easier  

and any verb can be formed into the emphatic  form in the pasty just like we saw with the  

present symbol so you could say I did finish  my homework you did call her last night he.

Did help with the project. She did find her  keys. It did rain yesterday we did watch the  

movie they did arrive early. Also keep in mind  the emphatic form that you've just learned exists  

in the present or past simple affirmative, which  means positive sentences only. So you can't use.

Emphatic form with perfect tenses, future  tenses, continuous tenses, the negative form,  

or question form, present simple positive, past  simple positive. Now that you know the rules,  

quite simple, right? Now that you  know the rules and the structure,  

let's quiz your knowledge.  You're going to see a question.

And then you need to answer out loud and  your answer must use the emphatic form.

And you'll have to look at the question to  decide if you need the present or the past.  

I'm not going to tell you just to make this quiz  more difficult. I'll only give you 3 seconds,  

so of course feel free to pause the video,  think about it, and then hit play when you're  

ready and you can say the answer out  loud. Question 1, you know how to swim?

The answer, I do know how to swim. You're  emphasizing this and notice my question,  

almost a statement but said as a question,  

there's an assumption that you don't know  how to swim or there's surprise in this.  

So that's why you're using the emphatic.  Question two, did he call you yesterday?

The answer? Yes, he did call me yesterday. The  question you did, so you know it's the past  

simple, and I'm emphasizing the truth of this.  Question three, you don't like coffee, do you?

The answer

Actually, I do like coffee. You don't need to add  actually or you could say yes, I do like coffee,  

or you could simply say I do like coffee  and notice in the question again there's an  

assumption that you don't like coffee. So that's  why you're using the emphatic form. Question 4.

This might be a little tricky. Feel free to  

pause. Question 4. It's OK that you  didn't finish the project on time.

How would you reply?

I did finish the project on time,  so the question assumes you didn't  

and you want to correct that by saying  no, I did finish the project on time.

Question 5, they never help with the cleaning.

How could you reply?

They do help they do help with the  cleaning. They do help sometimes,  

but you could simply say they do help.  So again, the question states that they  

don't and you want to affirm the opposite,  insist the opposite. They do help sometimes.

How are you doing with this? Question 6,  

I think I forgot to lock the  door. We should go back and check.

What could you say?

You did lock the door. I saw you.

You could add that or maybe you say I did lock the  door so you're affirming that you did the action  

so the person doesn't have to worry. So again  the person assumes that the opposite is true and  

you're emphasizing, you're affirminguestion  7, does she always come to work on time?

What could you say?

Yes, she does come to work on time,  so you're emphasizing that fact.

Question 8, why don't you eat vegetables?

You can reply back and say.

I do eat vegetables or maybe add I do eat  some vegetables. I do eat certain vegetables,  

so again the questioner assumes you don't  do something and you want to infer affirm  

or insist the opposite. Question 9, we need to  discuss why you didn't follow the checklist.

You can reply back to this and say.

I did follow the checklist. I did  follow the checklist. So again,  

contrary to what the person believed.

And question 10, they didn't attend  the meeting last Friday, did they?

You would say?

They did attend the meeting, so how do you  do with that quiz? Share your score in the  

comments and review this again so you  understand the structure of the present,  

the structure of the past, and when it's  used. And do you want me to keep helping  

you improve your grammar if you do put  yes, yes, yes, yes, yes, yes, put yes yes.

Yes in the comments below and of  course make sure you like this lesson,  

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lesson and you can get this free speaking  guide where I share 6 tips on how to speak  

English fluently and confidently. You can  click here to download it or look for the  

link in the description. And here's another  lesson I know you'll love. Watch it now.