高中英語語法it的用法

　　下面是小編搜集整理分享的高中英語語法it的用法，一起來看看吧。

　　It用法及其句型和固定搭配，是高中英語語法的重點(diǎn)、難點(diǎn)，又是高考英語的熱點(diǎn)，因此應(yīng)給予充分的重視，現(xiàn)將it用法歸納如下：

　　一、作人稱代詞

　　1、it代替前面(或后面)的單數(shù)名詞或分句等所表示的事物。

　　e.g. You cannot eat your cake but have it.(it代替前面的cake)Although we cannot see it, there is air all around us. (it代替后面的air)They say he has left town, but I don’t believe it. (it代替前面They…town分句中的情況)

　　2、代替有生命但不能或不必分陰陽性的東西(包括嬰兒)。

　　e.g. Yesterday we saw a big tree. It was fully twenty metres high. (it代替前面的tree)The baby cried because it was hungry. (it代替前面的baby)

　　3、在某些習(xí)慣說法中，可以代替人。

　　e.g. -- Someone is knocking at the door, Peter. -- Who is it? -- It’s me.

　　-- Who are singing? -- It is the children.

　　-- The light is still on in the lab. It must be the third-year students doing the experiment.

　　4、it與one的區(qū)別：這兩個詞都可以代表前面說過的名詞，但it用于同名同物的場合;one則用于同名異物的場合。

　　e.g. -- Do you still have the bicycle? -- No, I have sold it.

　　-- Is this knife yours? -- No. It is Xiao Zhang’s. Mine is the one on the desk.

　　5、it與that的區(qū)別：兩詞都可代替某一特定名詞，但that指同一類，并非同一個。

　　e.g. The climate of South China is mild(溫和的); I like it very much.(it指the climate of South China)The climate of South China is much better than that of Japan.(that指the climate)

　　二、作無人稱代詞it作無人稱代詞時，除了句中找不到它所代表的詞語外，另一個特點(diǎn)是它后面的內(nèi)容都是表示天氣、時間、距離、度量衡及情況等。

　　It is fine (rainy, windy, etc.).

　　It is noon.

　　It is a half hour’s walk to the factory.

　　It is eighteen square metres in area.

　　What does it matter?

　　三、作強(qiáng)調(diào)詞，構(gòu)成強(qiáng)調(diào)結(jié)構(gòu)用以幫助改變句子結(jié)構(gòu)，使句子的某一成分受到強(qiáng)調(diào)。“It is (was) + 所強(qiáng)調(diào)的成分+ that (who) + 其它成分。”在這個句型中，it本身沒有詞義。在使用強(qiáng)調(diào)句型時需注意以下幾點(diǎn)：

　　1. 請注意強(qiáng)調(diào)句型的特殊疑問句例When was it that he changed his mind to take part in the activity?

　　2. 在強(qiáng)調(diào)原因狀語從句時，只能強(qiáng)調(diào)由because所引導(dǎo)的從句例It was because he was ill that he didn't come to school yesterday.

　　3. 在強(qiáng)調(diào)not … until結(jié)構(gòu)時必須把not與until一起放到被強(qiáng)調(diào)的位置上例It was not until she took off her dark glasses that I realized she was my brother.

　　4. 注意強(qiáng)調(diào)句型與定語從句的區(qū)別例It was at 7 o'clock that he came here yesterday.( 強(qiáng)調(diào)句型)It was 7 o'clock when he came here yesterday.(定語從句)四、It用作形式主語It替代作主語的從句、動詞不定式、動名詞，而把真正作主語的從句、動詞不定式、動名詞置于句尾。

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