I left out a few sentences. Thank you.

I would like you to tell me the ones which are not possible.Thank you

1) I don't manage to get around to thanking you. Correctio: I can't get around to..
2) She brought up three children by herself/on her own. She brought three children up (is it possible?)
3) The long strike risks bringing the government (Government) down.
The headmaster permitted that the students got away with an admonition.
4) The headmaster let the students off with a warning (Are both possible?)
The headmaster let the students get away with a warning.
5) The headmaster decided that the students got away with a light punishment.
Wrong:the headmaster let off the students with ...
6) The coach made an extra stop to take on the students/to take the students on who lived in the next village.

1. This is too apologetic. Can you think of a better way to say what you wish.

2. All are possible and OK.

3. The long strike risks bringing the government down.

The headmaster permitted the students to get away with an admonition.

4) The headmaster let the students off with a warning.

The headmaster let the students get away with a warning.

5) The headmaster decided that the students got off with a light punishment.

6) OK