Ответ:

4. 2) Are they allowed to paint T-shirt on the last day of school?

Yes, they are;

3) Why are Nina and Skye have to wait for Dan?

Because, they wanted.

4) What are they have to do before Nina's mum arrives;

5) Is Nina's mum has to change her clothes.

5. 2) had to;

3) will have to;

4) mustn't write;

5) hasn't to come.