3. It is no good (use) doing sth．

2. It is important (necessary，right，strange，natural…)that…

　　 掌握本句型，应该记住所列举的形容词，并且记住that后的从句应用虚拟语气　 (should+动词原形)，should可以省去。

I. 形式主语型

1. It is clear (obvious，true，possible，certain…) that…

5．用于强调句型，即“It is/was+被强调部分+that/who/whom+其它”句型之中。

　使用该句型有以下几点请注意： ① 强调句的谓语is或was永远用单数. 　　

　 It was yesterday that I met your father in the street．

②不管被强调部分是哪种状语，只能用that连接，不得使用where、when等连词.

　 It was in the street that I met your father yesterday．

③被强调部分为人时，可用who(主格或宾格)和whom(宾格)代替that，用that也行。

1)　　　 It was your father that/whom /who I met in the street yesterday．

2) It was I that/who met your father in the street yesterday．

④强调句中 也要注意主谓一致、人称一致和否定转移的问题。

1)　　　 It is they who are our friends．

2) It was not until ten o'clock that we got home last night．

⑤注意不要混淆强调句和其他从句。It is was…that…为强调句标志，去掉后仍可组成一个完整的句子，只是没被强调,而其他从句一般不具备这一特征。 比较：

　 1) It was ten o'clock when we got home last night．我们昨晚到家时已十点了。 2) It was at ten o'clock that we got home last night．我们昨晚是在十点到家的。

第一句不是强调句，when不可改为that,因为去掉it was和that后，只能组成“We got home ten o'clock last night．”这样一个不完整的句子；第二句是强调句，that不可改为when．

4.用作形式宾语。

当复合宾语中的宾语是不定式,－ing短语或从句往往用it作形式宾语,而将真正的宾语移至句末,句子重心后移。

1) We find it difficult to learn English well in such a short time．

2) We think it no use crying over spilt milk．

3) We made it clear when and where we were going to have the meeting．

3．用作形式主语.it 没有具体意义，而只是帮助把真正的主语移至句子后尾，使句子显得平稳一些，能借it 给移至句子后尾的主语有三种：一种由不定式表示，一种由动名词表示，一种由从句表示。 　 　1).It 替代真正的主语--动词不定式短语. 　　　It is easier to say than to do . 　　　It is a good act to help the others. 　 2).it 替代真正的主语--动名词短语,以动名词短语做主语的句子，主要在以no good, no use, no harm, dangerous, foolish 等词作表语的句中. 　It’s no harm drinking running water in that area。 　It’s foolish talking like that.

3).it 替代从句作主语，用从句做主语的带it 的句子很多,常见的有下面几类： 　① It is a pity (a shame ,a fact ,a wonder ,a good thing,etc. )that… 　　　It is a shame that he didn’t pass the exam. 　② It is strange ( surprising,obvious　,true, good,possible,clear,etc.　) that… 。 　　　It was clear that they had no desire for peace. 　③ It seems (happened ,turned out,etc.)that… 　　　It seemed that things were not as they expected. 　④ It is said　( decided ,expected ,etc)that …　　 　It is said that the tickets have been sold out .

2．用于表达天气、环境、时间、距离、季节等。例如：

1) It’s half an hour’s walk from here to our school．

2) It‘s nice and warm here．

3) But it's two o'clock now, and it's time for us to go to school．

1．代替上文中提到过的人或事物。指代人时，一般用于小孩或身份不十分明朗的人。

1) －Who is the baby?　　

　　 －It‘s my teacher’s son．

2) －Who is that gentleman?

　　 －It's my friend Tom．He(不可用It) wants to see you．

　 　David是一位非常成功的商人，他的公司经营着两家工厂，因此他工作非常繁忙。但与此同时，他还积极参与各种慈善活动，尽他所能来帮助需要帮助的人。前不久，他作为杰出商人代表去做一个演讲。在演讲中，他谈及到了他自己的一些经历。原来，他来自于一个偏远的贫穷山村。在他很小的时候，那儿人们的生活环境非常恶劣。由于缺少新鲜的饮用水加上营养不良，人们经常生病，但又承担不起医药费，只得饱受病痛的折磨。孩子们也无法专心学习。David也由于贫困差点儿失去了继续上学的机会。非常幸运地，他受到了一位好心人的资助，每个月都会收到一笔钱以及一些学习用品。从那时起，他便更加努力的学习并目标考上重点大学。在好心人的帮助和他自己的努力下，他实现了他的目标。大学毕业后，他和几个朋友一起成立了自己的公司，为家乡人民创造了大量的就业机会，改善了人们的生活标准，并确保让家乡的儿童都能够完成义务教育。在演讲的最后，他还提及到在世界上许多地区，人们还生活在贫困中，许多孩子都面临着失学的危险，他呼吁人们在个人层面上去改变他们的生活。

答案：(相关词组)

In the meanwhile,

Take an active part in

　Do his best to help the people in need

Not long after,

Make a speech

Refer to his some experiences

A remote and poor mountainous town,

Lack of fresh drinking water and nutrition

Afford sth

Devote oneself to

Aim at

With the help of

Set up a company

Create a lot of employment opportunities

Complete primary education

In poverty

In face of

63. ……的收藏

a large collection of