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V. Ask your friend whether your groupmates must do these things.

EXAMPLE: to complete the test

A: Must Alex complete the test?

B: No, he needn't, but Dima must.

to follow these instructions

to determine the strength of polythene

to study the advantages of polymers

to receive new data

to draw up a laboratory report

VI. Put these statements into Present, Past and Future using the modal verb to have to (not to have to) instead of must (mustn't).

EXAMPLE: He must write a detailed report of the test.

He has to write a detailed report of the test.

He had to write a detailed report of the test.

He will have to write a detailed report of the test.

1. The students must complete another series of experiments.

2. They must compare the results of two tests.

3. Alice must determine the composition of nylon.

4. The engineers must develop new plastics.

5. The scientist must elaborate the plan of his research.

VII. Ask your friend if he had to do the following things last week.

EXAMPLE: to draw up a laboratory report

A: Did you have to draw up a laboratory report last week?

B: No, I didn't. But I will have to draw up a laboratory report next week.

to study the influence of temperature on the strength of plastics

to describe the properties of bakelite

to compare the properties of phenolic resin and polythene

to do research on thermoplastics

to follow the procedure of the laboratory experiment

VIII. Ask your instructor if these things must be done.

EXAMPLE: a detailed report of the experiment / to be written

Student: Must a detailed report of the experiment be written?

Instructor: Certainly it must. It must be written without mistakes.

oil / to be used as a raw material for plastics

plastics / to be widely applied in construction work

plugs / to be made of phenolic resin

the conclusions / to be included in the report

the procedure of the experiment / to be described in detail

IX. Give advice to your friend in the following situations. Use the modal verb should.

EXAMPLE: A: I have an examination tomorrow.

B: Well, you should work very hard tonight.

1. I don't know how to draw up a report of my expriment.

2. I'm very tired after the practical class.

3. I'd like to know more about plastics.

4. I d like to buy good sports equipment.

5. I want to become a materials engineer but I don't know what I must study and at what University.

X. Correct mistakes.

1. Denis hadn't to write a detailed report of the experiment with thermosets.

2. I will must to study all the peculiarities of this technological process next week.

3. He have to deliver a report on the applications of plastics.

4. I don't must switch on this machine without our teacher's permis­sion.

5. Have you to recycle unwanted nylon?

6. Must be non-recycable plastics burnt?

XI. Translate the sentences using your active vocabulary.

1. Інженери повині були модернізувати технологічні процеси.

2. Ми повині будемо написати доповідь про експеримент через тиждень.

3. Пластмаси можна розділити на термореактивні пласт­маси і термопластичні смоли.

4. На занятті студенти повинні будуть визначити прочность різних пластмас.

5. Робітники повинні були установити вінілові вікна в приміщенні.

6. Розвиток науки про матеріали повинен привести до удосконалення багатьох інструментів, підвищенню їх ефективності.

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