【正文】
re is easy to answer. c. ( correct) When we use certain words depends on the style of writing. a.( preferable) It is certain that we would not be able to understand Old English today.= ( preferable) It is easy to answer whether English will continue changing in the future.= ( preferable) It depends on the style of writing when we use certain words.= It 作形式主語的句型 : + be + adj. ( true, certain, possible, obvious, likely…) that… + be +noun phrase( no wonder, an honour, a pity,…) that… +be+pastparticiple ( said,reported,expected, 4. announced…)that… + seems/appears that…. doesn’ t matter that… B. When the subject is a toinfinitive: a. ( correct) To master a foreign language is hard. b. ( correct) To know how to use a puter is important. ( preferable) It is hard to master a foreign language.= ( preferable) It is important to know how to use a puter.= C. When the subject is a ving form a. ( correct) It is difficult to stop smoking. b. ( correct) It takes a lot of my time travelling to Beijing. 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. Tip ( preferable) Smoking is difficult to stop.= ( preferable)Travelling to Beijing takes up a lot of my time.= 2. It can also be used before seem, appear, happen, chance, turn out and prove as the empty subject of a sentence.: a. He seems to speak two languages. b. My new neighbour happens to e from my home town. It seems that he speaks two languages.= It happens that my new neighbour es from my home town.= 3.