They are doing their homework 变成一般过去式
They are doing their homework.(变成否定句)
They are doing their homework now.变成一般现在时和一般将来时
They are doing their homework?对doing their
they are doing their _____(homework) in the classroom
They are doing their homework carefully.you'd better not----
doing,they,school,homework,are,their,at 连成一句话
are they { }their homework?
They are doing homework.【改成一般疑问句和否定句】
the are doing their homework.对doing their homework提问
They are doing their homewolk.改成一般疑问句
they are doing their homework now they must hand in them aft
They have been doing their homework