Present perfect uses

2.  Affirmative Sentences : S+have+V-past participle+C
I have seen E.T.
You have eaten pork chops
 Negative Sentences : S+have+NOT+V-past participle+C
He has not been to Rome.
We have not played rugby.
 Interrogative Sentences : Have+S+V-past participle+C +?
Have you arrived?
Have they eaten dinner?
 (+) Yes, + S + have = Yes, I have
 (-) No, + S + have + NOT = No, I have not.

3.  When we use the Present Perfect in speaking, we often contract the
subject and auxiliary verb. We also sometimes do this in informal writing.
 In negative sentences, we may contract the auxiliary verb and "not":
You haven't got a chance.
She hasn't heard from him.
I have
→
I've
You have You've
He has
She has
It has
John has
The car has
He's
She's
It's
John's
The car's
We have We've
They have They've
You've told me that before.
John's seen Harry Potter.

4.  Affirmative Sentences : S+have+object phrase+V-past participle+C
I have already finished work.
You have just eaten chicken soup
 Negative Sentences : S+have+NOT+V-past participle+object phrase+C
He has not seen the movie yet.
We have not stopped learning yet.
 Interrogative Sentences : Have+S+V-past participle+object phrase+C +?
Have you already arrived?
Have they eaten dinner already?
 (+) Yes, + S + have = Yes, I have
 (-) No, + S + have + NOT = No, I have not.

5.  Use:
 Just: for recently completed actions.
 Already for actions completed before now.
 Already has two possible positions
 Yet with (-) sentences for actions that are expected to happen but are
incomplete.
‣ Use:
 Already in questions when you expect a (+) answer.
 It has two possible positions
 Yet in a question if you don’t know whether the answer is yes or no

6.  Affirmative Sentences : S+have/has+v-past part.+c+object phrase+c
I’ve lived here since I was a kid
She’s worked here for about two years
 Negative Sentences : S+have/has+NOT+v-past part.+c+object phrase+c
They haven’t seen him for a long time
She hasn’t worked since 2008
 Interrogative Sentences : have/has+S+v-past part.+c+object phrase+c +?
Have you already arrived?
Have they eaten dinner already?
 (+) Yes, + S + have = Yes, I have
 (-) No, + S + have + NOT = No, I have not.


7.  Use:
 Present perfect with for and since to talk about an action or state that started
in the past and continues now.
 For + time expression for the duration of an action.
 Since + time expression for the point in time that an action started.