什么时候用it什么时候用it is,如I think it difficult to do my homework.
问题描述:
什么时候用it什么时候用it is,如I think it difficult to do my homework.
答
应该是I think it is difficult to do my homework.
is是谓语
答
这句都可以
如果看成从句就是I think that it is difficult to do my homework
省略that就变成I think it is difficult to do my homework