Ex.15. Complete the following sentences using the most appropriate forms of the verbs.
1. Jack has got a headache. He … sleep well recently. a) can’t b) couldn’t have c) hasn’t been able to 2. I … sleep for hours when I was a little girls. a) could b) am able to c) can 3. Tom … play tennis well but he … play a game yesterday because he was ill. a) couldn’t, could b) can, was able c) can, couldn’t 4. I didn’t want to be late for the meeting. We … meet at 5 sharp. a) were to b) had to c) could 5. Where are my gloves? — I … put them on because it’s cold today. a) can’t b) have to c) needn’t 6. You … take an umbrella today. The Sun is shining. a) needn’t b) mustn’t c) can’t 7. I’m sorry, you didn’t invite me to your birthday party. You … invite me next time. a) must b) should c) need to 8. Well, it’s 10 o’clock. I … go now. a) can b) has to c) must 9. You … smoke so much. a) would b) can’t c) shouldn’t 10. We have got plenty of time. We … hurry. a) must b) needn’t c) should
Ex.16. Choose the correct answer a, b, c or d.
1) They must______. They have been working all day.
a) be tired
b) tired
c) to be tired
d) be tiring
2) You can't ______after having such a big meal.
a) hunger
b) hungry
c) be hungry
d) to be hungry
3) She must ______Ukrainian with such a surname.
a) to be
b) be
c) be being
d) –
4) They must ______very satisfied after being graded highly.
a) to feel
b) be feeling
c) felt
d) feel
5) You must ______! No one enjoys taking exams!
a) joke
b) not joke
c) be joking
d) not to joke
6) They can't____married! They are so different.
a) be getting
b) get
c) to be getting
d) to get
7) He ______be ill because I've just spoken to him.
a) can
b) must
c)should
d) can't
8) His train ______be late because it is always on time.
a) can
b) can't
c) shouldn't
d) ought
9) Where is Nick?
- I am not sure. He may______ the piano.
a) play
b) have played
c) be playing
d) be played
10) What's that smell! My mother must ______dinner.
a) cook
b) to cook
c) be cooking
d) to be cooking
11) His car is broken down. He ______an accident.
a) must have
b) must be having
c) should have had
d) must have had
12) You look tanned. You ______in Africa.
a) must have been
b) must be
c) need have been
d) can't have been
13) I am sure he ______a new car, because he is unemployed now.
a) must have bought
b) should have bought
c) might have bought
d) can't have bought
14)"Do you know where the Petrovs are?" "I think they ______to London."
a) should go
b) could have gone
c) must be going
d) may be going
15) The baby is looking for his mother. He ______lost.
a) can't get
b) must get
c) mustn't have got
d) must have got
16) She is tired. She ______on a long walk.
a) may be
b) mightn't
c) might have been
d) have been
17) She is wet. She ______her umbrella.
a) must have forgotten
b) mustn't have forgotten
c) should have forgotten
d) must forget
18) They hate each other. They ______in love.
a) can be
b) may be
c) can't be
d) can't have been
19) He loves her so much! He ______her when she is away.
a) must have missed
b) must be missing
c) may have missed
d) can't have missed
20) I don't like the way you study. I think you ____ harder!
might have worked
might work
could work
could have worked
21) Let's wait a little. He ____ .
may have come
could have come
may come
might have come
22)She ____ of the plan herself. Somebody has suggested it to her.
can't have thought
may not have thought
can't think
may not think
23) 'They ____ our telegram, that's why they did not meet us.
couldn't have received
can't have received
may not have received
may not receive
24) She ____ my letter! — Don't be so angry with her. She ___ it by mistake.
may not read, may do
cannot read, can do
might not have read, can't have done
can't have read, might have done
25) He ____ it. I don't believe you.
is not able to say
might not say
can't have said
might not have said
Ex.17. Translate these sentences into English.
1) Тот, кто не может подчиняться, не может командовать.
2) Любое событие в природе можно объяснить, опираясь на предшествующие события.
3) Вполне возможно, что давление в одной из этих точек можно выбирать по желанию.
4)Они должны быть способны распознать ту конкретную ошибку, которая имела место во входных данных.
5) Может быть, неэкономично делать исправления в то время, когда компьютер ожидает.
6)Несколько слов, касающихся приготовления образцов, вполне могут быть кстати.
7) Упрощение как метод (необходимый для) понимания может и должно быть средством усвоения знаний в любой науке.
8)Что касается температуры реакции, то ее приходилось строго контролировать.
9) Однако, они столкнулись с неотложными проблемами, которые им пришлось решать настолько тщательно, насколько они могли.
10) Программа или базы данных не должны изменятся.
11) В течение долгого времени вели спор о том, что программисты вовсе не должны заново изобретать колесо, всякий раз, когда они составляют программу.
12) Нам также не обязательно уметь объединять эти две величины.
13) Должно быть, это привело к тому, что молекула изменила свою конфигурацию.
14) Иногда он работал дольше, чем следовало.
15)Вероятно, для начала некоторое размежевание, каким бы временным оно ни было,
было неизбежным.
16) Должно быть, с давних времен развитие математики чисел приводило к философским загадкам.
17) Следующая возможность, которую придется принять во внимание при более тщательном анализе этой проблемы, заключается в отсутствии необходимости того, что ионные пары в любом данном растворе были одного и того же типа.