1
It is the end an email
2
it is used when we refer to more than one thing
3
it is used when we refer just to one thing
4
We use this word with the present perfect affirmative to say that something has happened (often earlier than expected).
5
We use this word with the present perfect to emphasise that the event is very recent.
6
It is the auxiliary used in present perfect with the personal pronouns: I, you, we, they
7
It is the beginning an email
8
It is the auxiliary used in present perfect in third person
9
We use this word with the present perfect negative to say that something expected hasn´t happened, or with the interrogative to ask if something expected has happened.
