【正文】
of a sentence. a. (preferable) It is certain that we would not be able to understand Old English today. (correct) =That we would not be able to understand Old English today is certain. b. (preferable) It is easy to answer whether English will continue changing in the future. (correct) =Whether English will continue changing in the future is easy to answer. c. (preferable) It depends on the style of writing when we use certain words. (correct) =When we use certain words depends on the style of writing. B. When the subject is a toinfinitive. a. (preferable) It is hard to master a foreign language. (correct) =To master a foreign language is hard. b. (preferable) It is important to know how to use a puter. (correct) =To know how to use a puter is important. C. When the subject is a ving form. 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. Tip: We usually use the empty subject it with a clause or toinfinitive (preferable), but with the ving form we prefer the real subject at the beginning. 2. It can also be used before seem, appear, happen, chance, turn out and prove as the empty 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 neighbour happens to e from my home town. 【設(shè)計(jì)說(shuō)明】 設(shè)計(jì)說(shuō)明:先簡(jiǎn)單復(fù)習(xí) “ it” 的功能。 Whoever breaks the rule must be punished. You can choose whatever you like in the shop. ② 疑問(wèn)詞 + ever還可引導(dǎo)讓步狀語(yǔ)從句。 wer e C. weren’t。 。 that 5. __C___ leaves the room last ought to turn off the lights. A. Anyone B.