Here are some more sentences I'd like you to check. Thank you very much.

1)If you are in the mountains, keep far (move away, stay away are possible?) from rocks and trees.
I have always had backaches from not doing any sport (sports)/from not doing sport.
Can “sport” be used in the plural form?
2)Do/practice/play sport, sports activities. Are they all possible?
Is it a problem for you if I borrow your shoes? Yes, it is.
Is it all right/OK with you if …..?
3)You should take a teaspoonful of cough syrup before bedtime.
I can shout to ask for help/I can shout for help.
May I borrow your high heeled shoes? (Give permission) Yes, you can (may?)
4) Do you mind if I stay out late? (Give permission): No, I don’t./ No, not at all. (Refuse permission) Yes, I do./I’d rather you didn’t.
5) I went on holiday to Greece OR I went to Greece for my holiday(holidays also possible?)
If you are in a building/inside a building/indoors, stay in a doorway since this is where the wall is the strongest.
6) Hamlet doubts whether or not to kill Claudius.
The ghost tells Hamlet that he has been murdered by his brother.
7) You were asked to list the features of the revenge tragedy and then explain why Shakespeare’s Hamlet is a revenge tragedy.

Please reread everything and post only the few that you have true questions about.

For example, I've already corrected this one at least once, but the corrections aren't showing up:
I have always had backaches from not doing any sport (sports)/from not doing sport.

1) If you are in the mountains, it is advised to keep a safe distance from rocks and trees. "Move away," "stay away," and "keep far" are all possible phrases you can use to convey this message.

For the second sentence, it would be more accurate to say, "I have always had backaches from not participating in any sports." Yes, "sport" can be used in the plural form as "sports." Therefore, you can say "not doing any sports" as well.

2) "Do," "practice," and "play" are all verbs that can be used with the word "sport" to describe engaging in physical activities. Therefore, "do sport," "practice sport," and "play sport" are all possible phrases.

When someone asks, "Is it a problem for you if I borrow your shoes?" and you want to give permission, you can respond with "Yes, it is all right/OK with me if you borrow my shoes."

3) The correct phrase is "You should take a teaspoonful of cough syrup before bedtime."

Both "I can shout to ask for help" and "I can shout for help" are correct phrases.

If someone asks, "May I borrow your high-heeled shoes?" and you want to give permission, you can respond with "Yes, you can."

4) If someone asks, "Do you mind if I stay out late?" and you want to give permission, you can respond with "No, I don't mind" or "No, not at all." However, if you want to refuse permission, you can respond with "Yes, I do mind" or "I'd rather you didn't."

5) Both phrases, "I went on holiday to Greece" and "I went to Greece for my holiday," are correct. Additionally, "holidays" can be used instead of "holiday" to indicate multiple vacations spent in Greece.

If you are in a building, inside a building, or indoors, it is recommended to stay in a doorway since this is where the wall is the strongest.

6) In the sentence, "Hamlet doubts whether or not to kill Claudius," Hamlet is uncertain about whether he should kill Claudius.

In the sentence, "The ghost tells Hamlet that he has been murdered by his brother," the ghost informs Hamlet that he has been killed by his own brother.

7) The task is to list the features of a revenge tragedy and then explain why Shakespeare's play, Hamlet, falls into this category.