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Choose the correct modal verb;
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Можно перевести / (must, may, can) be translated
Нельзя решить / (must not, cannot, may not) be solved
Нужно получить / (must, may, can) be obtained
Нельзя сделать / (must not, cannot) be done
Можно разложить / (must, can, cannot) be decomposed
Нужно применить / (must, can, cannot) be applied
Ex. 1. Choose and insert the correct forms:
a) (are carried on, is being earned on, has been carried on)
1. Such experiments... every day. 2. The experiment...and the results arevery good. 3. Don't enter the laboratory, a dangerous experiment....
b) (is added, has been added, is being added)
1. In this reaction this substance... always.... 2. The liquid is bluish because a drop of ink.... 3. What are you doing? What substance... now?
c) (is raised, was being raised, has been raised)
1. Look, the reaction has become quicker because the temperature... 2. Every time when the temperature... the reaction becomes quicker. 3. He couldn't finish the experiment at that moment because the temperature....
Ex. 2. Choose the correct modal verbs:
Должно быть обеспечено / (should, can) be provided
должна привести к... / (may, must) yield
нельзя получить / (may, can) not obtain
может быть получен / (may, must) be obtained
можно определить / (should, may) be determined
Ex. 3. Choose the correct forms:
1. The rate of the reaction was very slow because these two gases (are being mixed, had been mixed, have been mixed) before the temperature was raised. 2. You can't begin the experiment, the liquids (are being mixed, had been mixed, have been mixed), and this process will take some 20 minutes more. 3. Everything is ready. The two substances (are mixed, have been mixed, were mixed) just. You may begin your experiment. 4. If these two gases (are mixed, have been mixed, were being mixed) at high temperatures, a great amount of this chemical substance is produced. 5. The student had entered the laboratory before the experiment began. He felt some smell because two gases (have been mixed, were mixed, were being mixed) at that moment. 6. Listen! A very important question (was discussed, is being discussed, was being discussed)! 7. This question (was discussed, is being discussed, was being discussed) yesterday when I tame to the meeting. 8. Do you know when this question (was discussed, is being discussed, was being discussed)? - It (was discussed, is being discussed, was being discussed) a month ago.
Ex. 4. Translate the following:
1. The discovery of this substance is much spoken about. 2. His lectures are always listened to with great attention. 3. This requirement will be much spoken about. 4. This problem was paid much attention to. 5. Why is she being looked at now? 6. He is always laughed at. 7. They are being waited for. 8. What is it made of? 9. The lecture will be followed by a concert.
Unit12
Дата публикования: 2014-11-03; Прочитано: 1242 | Нарушение авторского права страницы | Мы поможем в написании вашей работы!
