課程內(nèi)容
高中英語《健康的生活 Unit 3 A healthy life(Part 3)》（選修6）
It is no use/good doing sth 做...沒有用/不
It is fun doing sth     做...很有趣
Proverbs(諺語）with "it"
①It is never too old to learn.
活到老，學(xué)到老。
②It is easier to fall than to rise.
摔倒容易爬起來難。
③It is no use crying over spilt（溢出的）milk.覆水難收
④It never rains but it pours(潑水）.
不雨則已，一雨傾盆。
不鳴則已，一鳴驚人
⑤It is easy to open a shop but hard to keep it always open.
創(chuàng)業(yè)容易守業(yè)難。
⑥It takes three generations(代）to make a gentleman.
十年樹木，百年樹人。
Read and analyze the sentences.
It is Friday today. date
It was very cold last Monday.     weather
It is about 8:30 now.   time
It is about 510km from Beijing to Shanghai.   distance
It lies in the south of the city.   place
It is 40℃ ！You got a high fever!   temperature
Conclusion:it可以用作非人稱代詞，表示日期、天氣、時(shí)間、距離、地點(diǎn)、溫度等。
It is obvious that the water was to blame.
It is true that he will treat me for breakfast tomorrow.
It is certain that our class will do a good job in the final exam.
Is it possible that he will become the chairman of our country?
It is amazing that at my age I still look like a student!
分析：it是形式主語，句子真正的主語時(shí)that 引導(dǎo)的主語從句。
牢記以下常用于該句型的形容詞
It is clear/obvious/true/possibly/certain/amazing/ridiculous等+that從句
思考：為什么要用it 做形式主語而把真正主語放到后面去？
遵循英語語法的尾重原則，避免句子頭重腳輕。
The use of"it"
一、用作人稱代詞，代表前面提到的人或事物
1)Who's it? (It's )me.
2)Look at the picture.(It)is a picture of our school.
二、用于代替指示代詞this和that
-Is this jacket yours?
-Yes,(it)is.
三、用以表示時(shí)間、距離、天氣、氣候、季節(jié)、環(huán)境等
1)It is half past eight now.  Time
2)It's only half an hour's walk from here to our school. Distance
3)I hope that it will be fine tomorrow.   Weather
4)It had rained much this year.    Weather
5)It's spring now.   Season
6)It's quiet here.  Circumstance
四、it用作形式主語
替代作主語的從句、動(dòng)詞不定式、動(dòng)名詞、而把真正作主語的從句、動(dòng)詞不定式、動(dòng)名詞置于句尾。
1.代作主語的動(dòng)詞不定式
1)It be adj.(for sb.)to do sth.
此處adj. 通常為描述事件的形容詞：
easy,difficult,hard,necessary,unnecessary,possible,impossible,likely,unlikely,right,wrong,important,unimportant,legal,illegal,well-mannered,polite,impolite,clear,obvious,certain,suitable,proper,fit,useful,useless,dangerous....
2)It be adj. of sb. to do sth.
此處adj.通常為描述人的形容詞：
kind,unkind,nice,rude,cruel,considerate,thoughtful,thoughtless,careful,careless,silly,foolish,stupid,clever,wise,crazy
3)It替代作主語的動(dòng)名詞的常見句型
It's no good/use doing....
It's (well) worth doing...
It's (well) worth one's while doing/to do.....
It's (well) worth while doing/to do
It's no use crying over spilt milk.
2.it作形式主語替代主語從句
①It is adj.+clause
It is clear(obvious,true,possible,certain...)that
該句型中it是形式主語，真正的主語是that引導(dǎo)的主語從句，常譯為“清楚（顯然，真的...）”，是主語從句最常見的一種結(jié)構(gòu)
It is very clear that he's round and tall like a tree.
②It is v-ed that...=sb./sth is to do
It is said (reported/learned/believed/thought/known/told/hoped...)that...
該句型中的it仍是形式主語，真正主語是that引導(dǎo)的主語從句；該結(jié)構(gòu)常譯為“據(jù)（據(jù)報(bào)道，據(jù)悉....）”。
It is said that he has come to Beijing.
It is reported that another earth satellite has been put into orbit.
③It is + noun +從句
It is a pity(a shame/an honor/a good thing/a fact/a surprise/...)that...
該句型中，that后的從句一般用虛擬語氣（should+動(dòng)詞原形），should 可省去。表示出乎意料，常譯為“竟然”。沒有這種意義時(shí)，則不用虛擬語氣。如：
五、it作形式賓語
當(dāng)符合賓語中的賓語是不定式、動(dòng)名詞賓語從句時(shí)，往往把賓語放在它的補(bǔ)足語后面，而用it作形式賓語，放在賓語補(bǔ)足語之前。
該句型中的it作形式賓語，常用的動(dòng)詞有think,believe,make,find,consider,feel等。
I think it no use arguing with him.
我認(rèn)為和他爭吵沒有用。
I found it very interesting to study English.
我發(fā)現(xiàn)學(xué)英語非常有趣。
He made it clear that he was notinterested in this sbuject.
他非常清楚地表示他對(duì)那門學(xué)科不感興趣。
六、用于強(qiáng)調(diào)句型中
It+be +被強(qiáng)調(diào)部分+that/who(a person)從句
I met Tom in the park yesterday.
1)It was I who met Tom in the park yesterday.
2)It was Tom who I met in the park yesterday.
3)It was in the park that I met Tom yesterday.
4)It was yesterday that I met Tom in the park.
It was five o'clock when I got home.
It was at five o'clock that I got home.
七、it常用的固定搭配
1.make it
1)在口語當(dāng)中相當(dāng)于succeed,表示：成功、做到、說定、趕上、及時(shí)趕到 如：
It's hard to make it to the top in show business.
2)在口語中相當(dāng)于fix the date for,表示“約定好時(shí)間”
-Shall we meet next week?
-OK.We just make it next Saturday.
2.take it/things esay
相當(dāng)于Don't worry or don't hurry,用來勸告別人，表示“不要慌，別擔(dān)心，沉住氣”
Take it easy!He will do it well.
3.It all depends/that all depends在口語中，相當(dāng)于it hasn't been decided yet,表示“那得看情況，還沒有定下來”
Are you going to the countryside for holiday?
-It/That all depends.
4.It's up to sb.
在口語中，相當(dāng)于it's decided by sb.表示“由...決定，由...負(fù)責(zé)，取決于...”
-Shall we go out for dinner?
-It's up to you.