they are doing their homework now they must hand in them after class.有语法错误吗?
问题描述：
they are doing their homework now they must hand in them after class.有语法错误吗?
答
them改为it
答
hand them in 不是hand in them
答
They are doing their homework now, they must hand in after class.
答
有，应该是they are doing their homework now because they must hand them in after class.
答
hand them in
答
hand them in
宾格放中间
答
hand in them 改为hand them in
答
they are doing homework they must hand in after class now