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Present perfect. We are going to look first of all at the present perfect and then we will see the uses of present perfect and past simple to know when to use one or the other one.

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Okay, the present perfect tense, the form, we have to put the verb to have in the present tense, okay, that is to say have or has, plus the past participle.

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What is the past participle? Well, the past participle in regular verbs is the verb ending in ed. For example, work, worked.

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Okay, try as they have here tried. Okay, so to form it you need two parts. Okay, the present tense of the verb to have, here you are, and then the past participle of the main verb, tried.

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I have tried sushi before. To make it negative, the only thing that you need to do is to place the not in between the have and tried. I have not tried sushi before. Or you could also say I haven't tried in the short form.

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And to make it interrogative, we just switch places between the have and the subject, okay?

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So, have you tried sushi before?

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Okay, next.

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We have to see that the present perfect tense, okay, in irregular verbs, here we have some examples.

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So we have with go, the past is went, and the present perfect they give us here that is have or has gone.

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Okay, in the verb to see, for example, the past will be saw and then have or has seen.

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You see, the verb to have plus the past participle of the main verb that we are using.

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eat, ate, have, has eaten. Present break, past broke and present perfect have, has

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broken. With regular verbs the past ends in "-ed", and the past participle that we

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need to make the present perfect also ends in "-ed", okay? So we have for example in

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the present asked, past asked, and present perfect have, has asked. Now, we are going

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to look at more examples written in affirmative, negative, and interrogative. Okay? So we have

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they have been to Italy twice. The negative, they haven't been to Italy twice. And the

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Interrogative, have they been to Italy twice?

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And the other example is with the verb to drive, okay?

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That a past participle is driven.

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So we have, she has driven her new car.

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Negative, she hasn't driven her new car.

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And the interrogative, has she driven her new car?

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key words, ok, that you will find or time expressions that you will find with the

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present perfect. Since, for, yet, ever, just, for, already, and never, ok? Now we'll see

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the present perfect versus the past simple, when to use one or the other one,

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okay so we have past simple that we only remember how we make the past simple

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now in regular verbs adding ed and in the irregular verbs is the second column

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offer a list of verbs no so we will use the past simple to express finished time

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we lived in Japan from 1995 to 1998. Whereas the present perfect will

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describe unfinished time. I've worked as a teacher since 2011. That means that you

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continue working as a teacher. When we use the past simple we refer to a

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definite time. I saw the Eiffel Tower in 2007. When we want to say it but

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we don't know the exact time, the time is indefinite, we don't know exactly when it

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happened, we will say I have seen the Eiffel Tower. And then we also use it

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to indicate series of finished actions. First he read the book and then he

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watched the movie. These finished actions will be expressed all of them through the

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past simple. But we will use the present perfect when we want to express

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experience or result. So we will say she has already watched this movie three

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times. Now here we have again the keywords to see when to use one or the

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other one so but simple you already know yesterday last week last month last year

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a few days ago a few months ago a few weeks ago the other day just now in

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2001 how long ago when okay and you will use the present perfect with today this

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month, this year, recently, lately, before, always, so far, just, already, yet, once,

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twice, how long, for, since. Okay the main ones, the main ones maybe will be just,

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already yet for and since that you are going to see in your book okay so now

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that is all about the past simple and the present perfect so thank you very much