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20. It takes sb. +time+ to do sth. 句式
It took thousands of people ten years to build the palace.
It takes years to master a new language.
【說明】此句型可以有如下幾種轉(zhuǎn)換：
It took me an hour to write the letter.
=The letter took me an hour to write.
=I took an hour to write the letter.
21. It is up to sb to do sth. 句式
It’s up to you to make the choice.
It is up to her to do the job.
22. I think it important to do sth. 句式
該句式中的it 作形式賓語。為了記憶方便，我們稱該句型為“6123結(jié)構(gòu)”。
6指主句中6個(gè)常用動(dòng)詞：think, believe, make, find, consider, feel；1指形式賓語it ；2指賓補(bǔ)的兩種形式：形容詞或名詞；3指真正賓語的三種形式：不定式短語，動(dòng)名詞短語或that引導(dǎo)的賓語從句。
This special strain of rice makes it possible to produce one-third more of the crop in the same fields.
She made it a rule to get up at six and take a walk in the morning.
Do you find it funny to see someone sliding on a banana skin,
The teacher feels it his duty to help the student with his English.
We thought it necessary that the two sides should stop arguing.
I consider it rude to stare at other people.
We believe it useless reading without standing.
22. I like it if (when) 句式
在一些表示“喜好、厭惡”的動(dòng)詞之后，如enjoy, like, dislike, love, hate, prefer, appreciate等，后接 if 從句或 when 從句，通常先在動(dòng)詞后接 it 作形式賓語。
She won’t like it if you arrive late. 她不喜歡你遲到。
He hates it when people use his bike. 他討厭別人用他的自行車。
I hate it if you say such things in public. 我討厭你在大庭廣眾之下說那樣的事。
I’d prefer it if I didn’t have to do so much work. 要是我不必做那么多工作，那就太好了。
I would appreciate it very much if you would help me with it. 如果你能幫助我做這事，我會(huì)十分感激。
I don't love it when she tells me how to do things. 我不喜歡她對(duì)我做事指手劃腳。
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