III.用it改写下列句子。
1.To learn Chinese is difficult for a foreigner.
2.Talking to him is(of)no use.
3.Mathematics is said to be the most important of all the sciences.
4.To write letters in Chinese is very difficult.(Tom finds)
5.That their son didn't pass the examination was a pity.(The parents thought)
参考答案及详解
1.It is difficult for a foreigner to learn Chinese.(形式主语)
2.It is no use talking to him.(形式主语)
3.It is said that mathematics is the most important of all the sciences.(形式主语)
4.Tom finds it very difficult to write letters in Chinese.(形式宾语)
5.The parents thought it a pity that their son didn’t pass the examination.(形式宾语)
