高中英語語法：It 所構(gòu)成的20個句型詳解

　　根據(jù)it的用法特點可歸納為20個句型

　　1. It is + 被強調(diào)部分 + that …

　　該句型是強調(diào)句型。將被強調(diào)的部分放在前面，其它部分置于that之后。被強調(diào)部分可以是主語，賓語，表語 或狀語。強調(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.

　　2. It is not until + 被強調(diào)部分 + that …

　　該句型也是強調(diào)句型。主要用于強凋時間狀語，譯成漢語“直到…才…”，可以說是 not … until … 的強調(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!