第1个回答 2011-07-19
She is doing homework now.
Is she doing homework now?
Yes, she is.
No, she isn't.本回答被提问者采纳
第2个回答 2011-07-20
Jim is doing his homework.
Is Jim doing his homework?
Yes,he is.
No,he isn't.
第3个回答 2011-07-19
He is watching TV .
Is he watching TV ?
yes ,he is
no ,he isn't