广东省交易平台:何时用of何时用for

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何时用of何时用for

崔荣斌

同学们都知道,在句型“It is+形容词+for sb. to do sth.”与“It is +形容词+of sb. to do sth . ”结构中,for短语与of短语都可以表示后面不定式的逻辑主语。但是不少同学却常常搞不清何时用of,何时用for。现分述如下: 1. 如果前面的形容词是表示赞美或批评的词语(如:kind , wrong , silly , careless等),而且不定式的逻辑主语是指具体的某个人,这时用of。此时句子也可以换成“sb. + be + 形容词+to do sth . ”结构。如:

It is very kind of you to do so.

You are very kind to do so.

你这么做真好。

2. 如果前面的形容词是表示赞美或批评的词语,后面不定式的逻辑主语不是指具体的某个人,而是泛指任何人,这时就要用介词for。如:

It is not polite for anyone to laugh at others.

任何人嘲笑别人都是不礼貌的。

3. 如果前面的形容词不是表示赞美或批评的词语,而是一些表示重要性或必要性、难度性、可能性等的形容词,这时一律用for短语。常见的这类形容词有hard , difficult , possible , impossible , important , necessary 等。如:

It is important for us to learn English well.

对我们来说学好英语是重要的。

练一练:用介词forof填空:

1. It is kind ______ you to help me.

2. It”s hard ______ me to help you.

3. It”s careless _____ you to lose so much money .

4. It is impossible _______ him to come tonight.

5. It is wrong _______ you to break the glass.

6. It is necessary _______ you to come earlier tomorrow.

Keys :

1. of 2. for 3. of 4. for 5. of 6. for