比绝萨
幼苗
共回答了19个问题采纳率:89.5% 举报
不定式和动名词不是动词,没有被动形式和完成形式.他们做主语时是可以互换的.
如:To help him clean the house is difficult .=Helping him clean the house is difficult.
但是to help him clean the house 如果放到后面去用形式主语来代就不可以与后一句互换了.
如:It is difficult to help him clean the house .可以.
而It is difficult helping him clean the house .不可以.
1年前
3