Номер 4 и 5......помагите

1.Are you doing a test Yes,Im.
2.Are your teacher sleepingNo,He is not.
3.Are your friends studying Yes, they are.
4.Is it raining todayNo, it isnt.
5.Are your classmates singing No,they arent.
6.Is your dad workingYes, he is.

We are not sitting in the park.
David is not ...
I am not working 
The dogs are not eating
Sarah is not having 
5) Are you doing a test 
Is your teacher sleeping
Is it raining today
Используйте вспомогательные глаголы am is are в зависимости от того, кто выполняет действие , а к концу слова прибавляйте ing 
принцип выполнения очень прост.