英语-按要求句型转换 He is doing his homework now

1 He is doing his homework now ( 变否定句）
He( is not ) doing his homework now

2.they are watching TV（对划线部分提问）
( What ) are they( doing ) ?

3.she is reading（变为一般疑问句,并否定回答,用括号的词,填空）
( Is she ) reading？
NO，she( isn't ). she( is writing ).

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He is not doing his homework now
2.they are watching TV（对划线部分提问）
_What are they doing?
3.she is reading（变为一般疑问句,并否定回答,用括号的词,填空）
Is she reading？
NO，she isn't she is writing

What are they doing?
Is she reading?
No,she isn't.She is writing.

is not
What doing
Is she isn't is writing