1.It is + 被強(qiáng)調(diào)部分 + that ... 就是強(qiáng)調(diào)句
該句型是強(qiáng)調(diào)句型.將被強(qiáng)調(diào)的部分放在前面,其它部分置于that之后.被強(qiáng)調(diào)部分可以是主語,賓語,表語或狀語.強(qiáng)調(diào)的主語如果是人,that可以由who換用.如果把這種句型結(jié)構(gòu)劃掉后,應(yīng)該是一個完整無缺的句子.這也是判斷強(qiáng)調(diào)句型與其它從句的方法.
It was about 600 years ago that the first clock with a face and an hour hand was made.
It was they that (who ) cleaned the classroom yesterday.
It was in the street that I met her father.
補(bǔ)充：
2. It is not until + 被強(qiáng)調(diào)部分 + that ...
該句型也是強(qiáng)調(diào)句型.主要用于強(qiáng)凋時間狀語,譯成漢語”直到．．．才．．．”,可以說是 not ... until ... 的強(qiáng)調(diào)形式.
It was not until she took off her dark glasses that I realized she was a famous film star.
= Not until she took off her dark glasses did I realize she was a famous film star.
= I didn’t realize she was a famous film star until she took off her dark glasses.
3. 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,肯定．．．）” 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.
= That he’s round and tall like a tree is very clear.
4. It is important ( necessary, right, strange, natural...) that ...
該句型和上一個同屬一個句型.由于主句中的形容詞不同,that 后的從句中要用虛擬語氣（should + 動詞原形）,should 可以省去.建議記住該句型中的形容詞.
It is important that we (should) learn English well.
It is necessary that he (should) remember these words.
5. It is said (reported, learned.) 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)說（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.
6. It is suggested ( ordered ... ) that ...
該句型和上一個同屬一個句型.主句中的過去分詞是表示請求,建議,命令等詞時,that 后的從句要用虛擬語氣（should + 動詞原形）,should 可以省.常譯為”據(jù)建議；有命令．．．）
It is suggested that the meeting ( should ) be put off.
It was ordered that we ( should ) arrive there in two hours.
7. It is a pity ( a shame ... ) that ...
該句型中,that后的從句一般用虛擬語氣（should + 動詞原形）,should可省去．表示出乎意料,常譯為”竟然”.沒有這種意義時,則不用虛擬語氣.
It is a pity that such a thing ( should ) happen in your class.
這種事竟然發(fā)生在你們班上,真是遺憾!
It is a pity that he is ill.他生病了,真遺憾!
8. It is time ( about time ,high time ) that ...
該句型中that 后的從句應(yīng)該用虛擬語氣,值得注意的是① 常用過去時態(tài)表示虛擬．② 有時也用should + 動詞原形,should 不能省.常譯為”是（正是）．．．的時侯．．．”.
It is time that children should go to bed.
= It is time that children went to bed.
9. It is the first ( second ... ) time that ...
該句型要和上一個句型區(qū)別開來.該句型中的 that從句不用虛擬語氣,而用完成時態(tài).
至于用什么完成時態(tài),由主句的謂語動詞的時態(tài)決定.如果是一般現(xiàn)在時,后面從句用現(xiàn)在完成時態(tài)；如果是一般過去時,后面從句則用過去完成時態(tài).該結(jié)構(gòu)中 that 可以省去；it有時用 this 替換．常譯為”是第一（二）．．．次．．．”.
It is the first time I have been here.
= This is the first time I have been here.太給力了，你的回答完美解決了我的問題！沒關(guān)系，有問題還可以問我哦再問您一個問題，one of+adj最高級+名詞復(fù)數(shù)是什么意思最·······之一