Unit 4

Question 1

PRESENT PERFECT

Versus

PAST SIMPLE

Answer 1

Remember that we use the present perfect to talk about
the past when the time is not especific
Eg: He’s watched LOTS OF dvds(but we don’t know when)
all your experiences up to now
I’ve visited London several times

We use the past simple to say when something happened or to give other details
Eg: She sent her first txt message two weeks ago
(not she has sent her first message two weeks ago)

When we ask questions in the past, we use the present perfect to stablish the facts
Eg: How many text messages has he sent ?(I don´t know)
Has he used the printer at work?8Yes, he has)

We use the past simple to ask for the especific time of an event, or for extra information:
Eg: When did he use the printer(Last week)
Did he use it several times?(Yes, he did)

Question 2

When we use NEVER in present perfect

When we use EVER in present perfect

Answer 2

We use in sentences with the present perfect to say that you have not had a particular experience at any time in the past
Eg:He’s never used a computer

We use in questions with the present perfect to find out if something has happened at any time in the past:
Eg: Have you ever used an e-reader - No, I’ve never used a e-reader

Question 3

FOR

And

SINCE

Answer 3

We use the present perfect with and to say how long something has lasted or when it started.
Eg: I have lived here for three years
I have Known John since 2007

We use to talk about a period of time
Eg: Ihave been at this school for a week/two days/three years/six month, etc.

We use to talk about a point in time in the past
Eg: I have been at this school since last week/Iwas five/July/2008/Tuesday, etc

Question 4

Prepositions:

ALREADY

YET

JUST

Answer 4

We use the present perfect with to say something happened in the past, but sooner than we thought. It usually goes after the auxiliare verb.
Eg: I can’t believe it, she’s already cleaned the floor

We use with present perfect questions and negative statements to say we think something will happen in the future. It usually goes at the end of a sentence.
Eg: Have you emptied the dustbin yet?
He hasn’t done the ironing yet

We use to mean “a very short time ago”.It usually goes after the auxiliare ver4b.
Eg: He’s just left(=about five minutes ago)