They can't have been doing their homework
They can't have been doing their homework
They can’t have been doing their homework ---doing是什么词性?have
They can’t have been doing their homework,能不能改成下面句子
They have been doing their homework
They can't have been doing thier homework.have been 是现在完成时,但
they don't doing their homework now.
They have finished doing their homework(改写句子)
They have finished doing their homework.Their homework _ _ _
Don't have your children______for hours doing their homework
They are doing their homework?对doing their
they-----[do/doing]their homework 选do还是选doing
Don't have your children ____ for hours doing their homework