they are playing footboll at school.改为否定句 i'm doing my homework now.改为一般疑问句,做否定回答the twins are singing in the room.对singing提问
问题描述:
they are playing footboll at school.改为否定句 i'm doing my homework now.改为一般疑问句,做否定回答
the twins are singing in the room.对singing提问
答
they are not playing footboll at school.
what are you doing, are you playing games? No, I am doing my homework.
What are the twins doing in the room?
答
They aren't playing football at school.
Are you doing your homework now? No, I'm not.
What are the twins doing in the room?