Вопрос по английскому языку:

5.1. Переведите предложения с инфинитивом. Определите его синтаксические функции.
1. То swim in the lake was pleasant.
2. То think of it helps me to be merry.
3. То smoke is bad for health.
4. It is strange to speak to him about it.
5. My desire is to speak English very well.
6. The purpose of the book is to describe the development of the mankind.
7. We must not speak to him about it.
8. We can actually begin the experiment.
9. The carbon has to be obtained from the carbon dioxide in the air.
10. At sunrise it started to snow.
11. Не continued to read the book. I promised him to do it.
12. Не advised me to think it over again.
13. Не caused me to tell him everything.
14. I requested my friend to wait a little.
15. I told him to shut the door.
16. I had no time to speak to him about it.
17. Не was not a boy to play alone. I haven’t got anybody to cheer me up.
18. I have come here to see her.
19. То answer this question you could know the rules.
20. Robert came in order to speak to me about it.
21. Once he was studying for three hours so as not to get a bad mark at school.