1 may; can, 2 may, 3 may, 4 can, 5 may, 6 may, 7 may, 8 can
1 Could you, 2 cannot, 3 could you, 4 could not work, 5 might, 6 will be able, 7 may, 8 could,not watch, 9 could have warned, 10 had better, 11 was able, 12 can, 13 Could
1 be able to, 2 be able to, 3 been able to, 4 could / might, 5 been able to, 6 be able to, 7 be able, 8 could, 9 could, 10 be able to, 11 to be able, 12 was able to (in opgave staat foutief ‘bought’ in plaats van ‘buy’
1 I have not been able to sleep all night / the whole night.
2 They will never be able to pay their debts.
3 You could / might have told me (this) earlier / sooner.
4 I could not catch the train.
5 We have not been able to / were not able to / could not carry out / execute your order sooner / earlier.
6 You had better take a train from the airport.
7 Because I had taken a taxi, I was able to catch the train.
8 Could you call me back tomorrow?
9 The setback could / might have been worse.
10 We were finally able to convince him. / Finally we were … / At last we … / We were … at last.
11 Their asking price could / might be too high.
12 You may be right.
13 Can you lift this heavy chair? / Are you able to lift …
14 We could have made / would have been able to make a bigger / larger / greater profit.
15 They have not been able to work for weeks because of / on account of / owing to / due to the severe frost.
16 He has not been able to prevent the accident. / He was not able to prevent … / He could not prevent …
17 I am sorry I could not meet / was not able to meet you yesterday.
18 Our competitor will never be able to offer the same quality.
19 It can be very dry in this region / area.
20 Most people have to borrow money to / in order to be able to buy a house. / ... need to borrow ...
21 We have been able to / were able to expand our market share.
22 After two unsuccessful / failed attempts the mountaineers were able to reach the top / summit.
23 So far / Up till now / Up to now we have not been able to find a suitable house.
24 You had better not drive when you have drunk too much.
25 We could have / might have known (that) she is not reliable / unreliable.
26 I was not able to drive / could not drive because I had broken my leg.
27 I would like to be able to speak better French. / speak French better.
28 In the future we hope to be able to give / provide a better service.
29 This virus can cause an infection.
30 He could already drive (a car) when he was fifteen. / He was already able to drive …
31 Fortunately the lifeboat was able to rescue the crew.
32 He can be very impatient sometimes. / Sometimes he can be ... / He can sometimes be …
1 was able to / managed to: Could cannot be used if the past ability refers to what really happened in one particular situation. In such a case, was / were able or managed is used.
2 may: may is used to express a possibility in a specific case. (Can is used for a general possibility.)
4 were able to / managed to: Could cannot be used if the past ability refers to what really happened in one particular situation. In such a case, was / were able or managed is used.
5 would have been able / could have: an unrealised ability is expressed by could have or would have been able to.
8 were not able: The past tense must be used because there is an indication of past time in this sentence (yesterday).
9 had better: had better is used to express a strong advice.
12 were able to / managed to: Could cannot be used if the past ability refers to what really happened in one particular situation. In such a case, was / were able or managed is used.
14 would have been able to get / could have got: an unrealised ability is expressed by could have or would have been able to.
1 spent, 2 would be able, 3 had bought, 4 were sold, 5 sold, 6 has not been able (in tekst ontbreekt ‘to sell’, 7 could have 8 lost