Are there any students in the classroom?

[Pedro8686]

Hello. Could somebody please check if all the sentences below are correct/possible and perhaps write why any of them are incorrect?

1) Are there any students in the classroom?
1a) Yes, there are some students in the classroom.
1b) Yes, there are.

2) Are students in the classroom?
2a) Yes, they are.
2b) Yes, there are (students in the classroom).

3) Are any students in the classroom?
3a) Yes, there are some (students in the classroom).
3b) Yes, there are.

4) Are there students in the classroom?
4a) Yes, there are (students in the classroom).
4b) Yes, there are some (students in the classroom).

A) I haven't got money.
A1) I haven't got any money.
B) I don't have money.
B1) I don't have any money.

Are all the questions and answers possible?

Regards