It is quite hard for me to explain why.
注意:it is+adj.+of/for sb.to do sth.中,如果表语形容词能够说明不定式逻辑主语的性质、特征与面貌时用of;如果说明不定式行为本身的性质、状态等时则用for。
(12)兼作连词和副词的介词。
①after,since,till/until,before这些词既是介词,又是连词。
The children went home at once after school.(介词)
They went to bed after they had finished the job.(连词)
②in,on,along,down,up,after,before,beyond等介词可兼作副词。
He ran down the hill.(介词)
Can you lift that box down from the shelf for me?(副词)
③有的介词可以兼作连词和副词。
All the students got to school before me.(介词)
We do want to buy something now before prices go up.(连词)
Haven’t I seen you before?(副词)
(13)介词的省略。
某些动词搭配中的介词可以省略。
Nothing can prevent me (from) doing the job.
She spent nearly two hours (in) translating it.
(14)某些名词与介词构成的固定搭配。
①要求接to的名词有:key,answer,visit,entrance,apology,introduction,road等。
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