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Unit 5 Technology, 5D Grammar, Modals in the past, page 55

Exercise 1 

1 might have

2 must have

3 can’t have

4 could have

5 could have

6 must have

7 must have

8 can’t have

 

Exercise 2 

1 must have missed

2 can’t have got

3 can’t have taken

4 must have eaten

5 must have finished

6 can’t have injured

 

Exercise 3 

1 d You shouldn’t have dropped it on the pavement.

2 a We should have brought the satnav.

3 f You shouldn’t have called your friend when you were abroad.

4 b You should have chosen a better password.

5 e You shouldn’t have made those comments on Twitter.

6 c You should have charged it overnight.

 

Exercise 4

1 must have

2 can’t have

3 may / might / could have

4 may / might / could have

5 might not have

6 may / might / could have

7 can’t have

8 must have

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