= That  he’s round and tall like a tree is very clear. ⑵It is important ( necessary, right, strange, natural...) that 从句  常译为┅是重要的(必要的,对的,奇怪的,自然的┅).that 后的从句中要用虚拟语气(should + 动词原形),should 可以省去,建议记住该句型中的形容词。    ①It is important that we (should) learn English well.      ②It is necessary that he (should) remember these words.  ⑶It is said (reported/ learned/believed/thought/known/told/hoped.....) that 从句 常译为"据说(据报道,据悉...)"。      ①It is said that he has come to Beijing.      ②It is reported that another earth satellite has been put into orbit.  ⑷It is suggested ( advised/ ordered / demanded/ insisted/ commanded... ) that 从句.that 后的从句要用虚拟语气(should + 动词原形),should 可以省;常译为"据建议;有命令...)     ①It is suggested that the meeting ( should ) be put off.     ②It was ordered that we ( should ) arrive there in two hours.

⑸It is time ( about time ,high time ) that从句(虚拟语气:动词用过去时did)

①   It is time that children went to bed.

②   It is time you bought a new car.

③   It is (high ) time you made up your mind.

⑹It is the first ( second ... ) time that从句(从句用现在完成时 have done )

  It was the first ( second ... ) time that从句(从句用过去完成时had done )

  常译为"是第一(二)...次..."。 It is the first time I have been here. = This is the first time I have been here

⑺It is a pity ( a shame /an honour/a good thing/a fact,/a surprise/... ) that从句. 

that后的从句一般用虚拟语气(should + 动词原形),should可省去.表示出乎意料,常译为"竟然"。没有这种意义时,则不用虚拟语气。   ①It is a pity that such a thing ( should ) happen in your class. 这种事竟然发生在你们班   上,真是遗憾!     ②It is a pity that he is ill. 他生病了,真遗憾!

⑻It happens (seems, looks, appears ) that从句.常译为 “ 碰巧…,似乎是…,看起来…”

    ①It happened ( so happened ) that he met his teacher in the street. 碰巧... ②It seems that he will be back in a few days. 看来...

2.作形式主语替代不定式   . ⑴ It is kind ( of sb. ) to do sth. 不定式的逻辑主语是由 of引起,主句中的形容词必须是能表示逻辑主语特征的褒义或贬义形容词。 常见的词有:

 bad , brave , careless, clever , cruel , foolish , good (好心的), honest , horrible , kind , lazy , modest , naughty , nice(有教养的), polite, rude , silly , stupid , wise , wrong(错误的)等。

 这个句型可以改写为:sb. is kind to do sth. 。  如:It is kind of you to say so. = You are kind to say so.

⑵It is necessary ( for sb. ) to do sth. .不定式的逻辑主语是由for引起,主句中的形容词通常是表示重要性,紧迫性,频繁程度,难易,安全等情况的中性形容词。 常见的形容词有:

 important, necessary, natural easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant

如:It is important for her to come to the party. = It is important that she (should ) come to the party. ⑶It takes sb. ... to do sth. 常译为"做...要花费某人..."。   如:It took thousands of people many years to build the Great Wall.

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