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补充语法点:
一、不定式的逻辑主语
1、在for引导的不定式复合结构中,介词的宾语是不定式的逻辑主语。如:
It is necessary for all of us to help each other.
注意:在“It is good(nice,kind,wrong)of you (them,him,her)to do sth.”句型中,介词宾语也是不定式的逻辑主语。如:
It was careless of us to forget to lock the door.
2、不定式在复合宾语中作宾补时,宾语是其逻辑主语。如:
I will have someone repair it for you.
注意:但在被动语态中,宾补变为主补,所以,句子的主语是不定式的逻辑主语。如:
They were made to work day and night.
3、不定式作宾语时,句子的主语是其逻辑主语。如:
He offered to help us.
4、不定式作定语时,所修饰的名词是其逻辑主语。如:
A factory to produce plastics(=A factory which is to produce plastics)will be set up near the town.
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