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a. ( preferable) Smoking is difficult to stop. = (correct) It is difficult to stop smoking. b. (preferable) Travelling to Beijing takes up a lot of my time. = (correct) It takes a lot of my time travelling to Beijing. We usually use the preparatory subject it with a clause or toinfinitive (preferable), but with the ving form we prefer the real subject at the beginning. Tip 2. It can also be used before seem, appear, happen, chance, turn out and prove as the preparatory subject of a sentence. a. It seems that he speaks two languages. = He seems to speak two languages. b. It happens that my new neighbour es from my home town. = My new neighbor happens to e from my home town. 1. It + be + adj. ( true/ certain/ possible/ obvious, likely…) that… 2. It + be +noun phrase (no wonder/ an honour/ a pity/…) that… 3. It+ be + past participle (said/ reported/ expected/ announced/ suggested…) that… 4. It + seems/ appears/ happens/ proves/ turns out that…. it 作形式主語(yǔ)的句型 : Writing 6月將來(lái)臨, Mary將面臨一場(chǎng)重要的考試 高考。 能否在高考英語(yǔ)中取得好成績(jī)是她一直擔(dān)心的事。( what 主語(yǔ)從句) 她發(fā)現(xiàn)學(xué)好英語(yǔ)是很重要的,那是因?yàn)樗鞘澜缟献? 被廣泛使用的語(yǔ)言。( it作形式主語(yǔ)和表語(yǔ)從句) 她的愿望是被一所重點(diǎn)大學(xué)錄取。 可是事實(shí)是她的成績(jī)不是很理想。 但她堅(jiān)信人人都有獲得成功的潛力。 總之,她會(huì)盡一切努力實(shí)現(xiàn)她的夢(mèng)想。 Writing What worries Mary most is whether she can achieve high grades in English in College Entrance Examination. She finds it is important to learn English well. That’s because it is the most widely spoken language all through the world. It is her hope that she can be admitted into a key university. However, it’s a fact that she doesn’t do well in study. But she holds a belief that everyone has the potential to achieve success. All in all, she will do whatever she can to realize her dream .