Since, yet, for, already

In the laboratory....

Sue: 'Haven't you left yet?'

Michael: 'No. I’ve been here _____ 8.00 this morning.'

Sue: 'Have you checked the results of the experiment _____? '

Michael: 'Yes, I’ve _____ done that.'

Sue: 'We’ve worked on this project _____ three weeks. Unfortunately we haven't discovered anything interesting _____.'

Michael: 'No, nothing has happened _____ last Tuesday.'

Sue: 'Yes, I know. I’ve _____ seen your report.'

Michael: 'So I’m going to do the experiment again. But I haven't started it _____.'

Sue: 'Don't bother. I’ve _____ started it. I haven't checked _____, but I think we're going to get the same results.'

NOTE: Spot the difference between the following: Have gone to / Have been to / Have been in

He has gone to Brussels. (= He's there or on his way to Brussels.)

He has been to Brussels once. (= He's visited Brussels but he's back now.)

He has been in Brussels for two months. (= He's in Brussels now.)

8.3 Fill in: has - have been in/to, has - have gone to:

Editor: Where's Stevens? I haven't seen him for days.

Secretary: He 1) has gone to Washington to interview Kim Basinger.

Editor: How long 2) ___ he_______ Washington?

Secretary: Three days.

Editor: What about Milton and Knowles?

Secretary: They 3) ___ _______ London. They're going to interview the Royal Family.

Editor: 4) ___ anyone _______ Paris to talk to Main Delon?

Secretary: Smith 5) ___ _______ his country house. He interviewed him there yesterday actually. He's coming back today.

8.4 Use the prompts to make a present perfect simple question about scientific advances. Then answer yes or no:

e.g. scientists / discover a cure for the common cold? – Have scientists discovered a cure for the common cold?

1. people / live for long periods in space?

2. human beings / land on Mars yet?

3. scientists / invent time travel yet?

4. doctors / manage to transplant human hearts?

5. archaeologists / find the lost city of Atlantis?

6. scientists / ever teach an animal to talk?

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