I. Read the following phrases and state the infinitive forms. 1.'There is only one thing worse than being talked about, and that is not being talked about. ’Oscar Wild, Irish writer
2. ‘Politics are too serious a matter to be left to the politicians.’ Charles de Gaulle, former President of France
3. 'A celebrity is a person who works hard all his life to become well-known, and
then wears dark glasses to avoid being recognized. ’Fred Allen, American humorist
4. 'A politician is an acrobat - he keeps his balance by saying the opposite of
what he does. ’Maurice Barres
5. 'When it is not necessary to change, it is necessary not to change.
Luicius Cary, English royalist politician
6. ‘Money can’t buy friends, but you get a better class of enemy.’ Spike Milligan, Irish
comedian
7. ‘Failure is not falling down, it is not getting up again to continue life’s journey.’ Richard Nixon, former Preident of the US
8. ‘It is better to have loved and lost than never to have loved at all.’ Lord Tennyson, English poet
9. ‘It is impossible to work out what he believes in. He agrees with whoever he happens to be speaking to at the time.’ Journalist describing US President, Bill Clinton

II. Put in the right form of the infinitive.
1. I ought to (work) on a new project now.
2. That document must (sign) before tonight.
3. I meant (phone) to my boss, but I forgot.
4. You were silly not (lock) your car
5. There are a lot of tasty things (be, eat).
6. He doesn’t like (interrupt) while he’s working.
7. You could (be, kill).
8. Try (not be) back late.
9. You should (tell) me you bought some cell phone gadgets.

III. Rewrite these sentences using the perfect infinitive.
1. I’m glad I’ve met you.
2. I’m sorry I had disturbed him.
3. I expect I’ll have passed all my exams by June.
4. I’m happy that I’ve had a chance to talk to you.
5. I was disappointed that I had missed the party.
6. We are sure that we will have finished the job by January.
7. It seems that I annoyed my boss yesterday.

IV. Choose the right form of infinitive.
1. Celebrities say it’s annoying to be stopped/to have stopped/to be stopping in the street by fans, but I’m sure the time to worry/to have worried/to have been worried is when no one recognizes you any more!
2. General Ford is thought be /to be/to have been the only US president to work/to have worked/to be working as a model.
3. What a pity I missed the Prime Minister’s speech on TV last night. I’d like to have seen/to see/see it. It’s sure being repeated/to repeat/to be repeated this evening, though, I suppose.
4. John Lennon is perhaps the most famous celebrity to have murdered/to have been murdered/to murder by a so-called fan.

V.Study the usage of modal verbs followed by perfect and non-perfect infinitives. Translate the sentences.
1. Most primitive tools and devices must have been invented independently by different civilizations.
2. If there was someone to put a question there must be somebody, sooner or later, to answer it.
3. There has to be a way out of any situation.
4. Everyone might be granted the right to be occasionally wrong.
5. Nature would never be exhausted to challenge man with more riddles.
6. A true scientist will enjoy his work more than anything else and would often be prepared to sacrifice his weekends and vacation in order to proceed with his research.
7. At all the times there were ideas which should have been given more attention than they actually were.
8. Good ideas should be written down before they are forgotten.
9. Intelligence of human quality is not to be achieved overnight; there ought to pass plenty of time for anything comparable in complexity to human brain to evolve.
10. Not a single scientist shall work on the problems whose solution may be a threat to mankind.

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