介词

prep.+n./代词(宾格)/doing/being+adj.(adv)/宾语从句
如:for being late(adj.)

to do sth.(不定式)
to(介词) +n./代词(宾格)/doing sth.

sth. is important=sth. is of importance
sth. is valuable=sth. is of value
sth. is benefical=sth. is of benefit

介词相当于副词

知识点:
介词短语在句子中的功能:

1.在系动词后作表语
2.在名词后作后置定语
3.vt.+n.(宾语)+介词短语(宾补)

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