40)It’s + a shame / nice/ kind + to do (做.....真惭愧/好)，例如：It’s a shame to lose  the match. 输了比赛，真惭愧!It’s nice of you to tell me the truth. 你太好了，告诉我真相。It’s your  turn to look after the young trees. 该你照顾这些小树了。

41)It is obvious/clear that + 从句 (…是明显的)，例如：It is obvious that knowledge  plays an important role in our life.可想而知，知识在我们的一生中扮演一个重要的角色。

注意：此句型中it是形式主语，其后谓语可以有不同变化。例如：

It’s certain that he will win the election. 他肯定会赢得选举。

It is true that we must make our greater efforts; otherwise we cannot catch  up with the developed countries.是真的，我们要作出更大的努力，不然/否则，我们不能赶上发达国家。

It is hard to imagine how Edison managed to work twenty hours each  day.很难想象爱迪生每天是怎样工作20小时的。

It’s hard to say whether the plan is practical.这个计划是否实际很难说。

It is a common saying that where there is a will ,there is a  way.俗话说，有志者，事竟成。

It must be pointed out that it is one of our basic State policies to control  population growth while raising the quality of the population.  一定要指出的是国家基本政策之一是在提高人口质量的同时控制人口增长。

It must be kept in mind that there is no secret of success but hard work.  一定要记住的是成功的秘密是努力的工作。

It can be seen from this that there is no difficulty in the world we cannot  overcome.从这里可看出，世上没有克服不了的困难。

It has been proved that his theory is right.已经证明，他的理论是对的。

42)It is/ was ….that… (强调句型), 例如：It was on the desk that you put your book.  你把书放桌子上了。It was the doctor that inquired what had happened. 医生询问了发生的事情。

43)I don’t think / feel/ suppose that… (否定前移)，例如：

I don’t think that we shall finish it on time. 我认为我们不能按时完成(工作)。

44)The reason why + 从句 is that + 从句 (……的原因是……)，例如：

The reason why we have to grow trees is that they can provide us with fresh  air.

The reason why we have to grow trees is that they can supply fresh air for  us.我们必须种树的原因是它们能供应我们新鲜的空气。

The reason why the river is polluted is that the factory has poured much  waste into it.这条河受污染的原因是那家工厂向里倾到了很多垃圾。

注意：表示原因还可用以下句型。请比较：That is the reason why …. (那就是……的原因)，例如：Summer is very  hot. That is the reason why I don’t like it.夏天很热。那就是我不喜欢它的原因。

45)It will (not) + 时间段 + before…(……需要很长时间), 例如：It will be a long time before  everything returns to normal. 一切恢复正常需要很长时间。

46) I think / feel/ find it + important/ our duty + to do…  (我发觉做……重要/是我的责任),例如：I feel it our duty to help the old. 我觉得帮助老人是我们的职责。

47)Those who…. (……的人……)，例如：Those who violate traffic regulations should be  punished.违反交通规定的人应该受处罚。

注意：此句型还可以转化为one/a person who…, 例如：

As the saying goes, nothing in the world is difficult for one who sets his  mind to it.俗话说，世上无难事，只怕有心人。In a certain sense, a successful scientist is a  person who is never satisfied with what he has  achieved.在某种情况下，一个成功的科学家就是一个绝不满足于自己已取得的成就的人。

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