1.替代词it,替代同一事物而非同类事物,也可指代前面整个句子。如:Tom’s mother kept telling him that he should work harder, but it didn’t help.
2.先行词it,用于名词性从句中,作形式主语或宾语。如:I like it in the autumn when the weather is clear and bright.
3.引导词it,用于强调句型中。如:It was not until midnight that he went back home after the experiment.
4.虚意it,无具体意义,用来指时间、距离、天气等或较笼统、较模糊的情况。如:
-----I’d like to take a week’s holiday.
-----Forget it. We’re too busy.
5.人称代词it,指动物或无生命的东西,如:
Bill’s aim is to inform the viewers that cigarette advertising on TV is illegal, isn’t it?
【考例1】I don’t mind her criticizing me, but ______ is how she does it that I object to.
A. it
B. that
C. this
D. which
(A)
【考例2】------Have you heard the latest news?
-------No, what _____?
A. is it
B. is there
C. are they
D. are those
(A)
【考例3】He didn’t make _____ clear when and where the meeting would be held.
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