1-
1) Are having
2) are not studing
3) is trying
4) is running

2-
1) is washing
2) are sking
3) are trying
4) is working
5) am writing

3-
1) *respndido como exemplo*
2) My computer is not working at the moment.
3) I am cleaning the garage.
4) They are not doing their Math homework now.

4-
1) Is he playing tennis with his older sister?
2) Are the girls swimming at the lake?
3) Are we thinking at the same person?
4) Am I trying to find a solution to the problem?

Espero ter ajudado.