1 . My son asked me … let him … go to the club. 2 . You must make him … practice an hour a day. 3 ....

1. My son asked me to let him go to the club.
2. You must make him practice for an hour a day.
3. She was made to repeat the song.
4. He is not sure that it can be done, but he is willing to try.
5. Let me help you with your work.
6. She asked me to read the letter carefully and write an answer.
7. You ought to take care of your health.
8. I looked for the book everywhere but could not find it.
9. He was seen leaving the house.
10. We had to put on our overcoats because it was cold.
11. The man told me not to walk on the grass.
12. Have you heard him play the piano?
13. You had better go there at once.
14. I would rather not tell them about it.
15. We shall take a taxi so as not to miss the train.

Давайте разберем каждое предложение, чтобы понять, какие формы глаголов следует использовать и почему.

1. My son asked me to let him go to the club.

   • Здесь используется инфинитив с частицей "to" после "asked" и "let". "Ask" требует инфинитива с "to" для выражения просьбы, а "let" — без "to" для выражения разрешения.

2. You must make him practice an hour a day.

   • Глагол "make" требует использования инфинитива без "to". Это особенность конструкции, где "make" побуждает кого-то сделать что-то.

3. She was made to repeat the song.

   • В пассивной конструкции с "make" используется инфинитив с "to".

4. He is not sure that it can be done, but he is willing to try.

   • После "can" используется инфинитив без "to", а "willing" требует инфинитива с "to".

5. Let me help you with your work.

   • Глагол "let" требует инфинитива без "to".

6. She asked me to read the letter carefully and to write an answer.

   • "Ask" требует инфинитива с "to", и при однородных сказуемых "to" обычно повторяется для ясности.

7. You ought to take care of your health.

   • "Ought" всегда требует инфинитива с "to".

8. I looked for the book everywhere but could not find it.

   • После "could" используется инфинитив без "to".

9. He was seen to leave the house.

   • В пассивной конструкции с "see" используется инфинитив с "to".

10. We had to put on our overcoats because it was cold.

    • "Had to" выражает необходимость и требует инфинитива с "to".

11. The man told me not to walk on the grass.

    • "Tell" требует инфинитива с "to", а отрицание выражается с помощью "not to".

12. Have you heard him play the piano?

    • Глагол "hear" в активной конструкции требует инфинитива без "to".

13. You had better go there at once.

    • Конструкция "had better" требует инфинитива без "to".

14. I would rather not tell them about it.

    • Конструкция "would rather" требует инфинитива без "to", а отрицание выражается через "not".

15. We shall take a taxi so as not to miss the train.

    • "So as" требует инфинитива с "to", а отрицание выражается через "not to".

Надеюсь, это объяснение поможет вам лучше понять использование инфинитивов в английских предложениях.