Hi. 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?

*"Are *__the__ students in the classroom?"
2a) Yes, they are.

2b) Yes, there are (students in the classroom).

*In the context of the question, this is not a valid response. 2a) is correct.*
3) Are any students in the classroom?

*You need "there" before "any"*
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.

*See A1)*
A1) I haven't got any money.

B) I don't have money.

*See B1)*
B1) I don't have any money.

Are all the questions and answers possible?

cheers