2010届高考英语it的用法
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课件16张PPT。It的用法1. it作人称代词,代替前面提到的事物.
2. it指代时间,季节,距离.
3. it作形式宾语,常用在6123结构中.(think , find, make, believe, …)
4. it作形式主语. 当动名词,不定式,从句作主语时,常用it作形式主语.
5. It is … that….的强调句型.内容提要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。 例如：
－Who is the baby? －It’s my teacher’s son．
－Who is that gentleman?
－It’s my friend, Tom．He (不可用It) wants to see you．
【典型例题】 (NMET2001)
The Parkers bought a new house but _____ will
need a lot of work before they can move in.
A. they B. it C. one D. which B2．用于表达天气、环境、时间、距离、季节等。
◆ It’s half an hour’s walk from here to our school．
◆ It’s nice and warm here．But it’s two o’clock now, and it’s time for us to go to school．
注意下列几种表示时间的句型 ①.It is time ( about time ,high time ) that ...
◆ It’s high time that we left.
②.It is the first ( second ... ) time that ...
◆ It’s the first time that I have been praised.
③.It is .... since ...
◆ It’s three years since they got married.
④.It is / was ... when ...
◆ It was 1949 when the PRC was founded.
⑤.It is / was ... before ...
◆ It will be two years before we meet again.3. We think it important to learn a foreign language. 该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。 ?6 指主句中常用的动词：think, believe,
make, find, consider, feel； ?1 指的是形式宾语 it； ?2 指的是宾补的两种形式：形容词或名
词； ?3 指的是真正宾语的三种形式：不定式短
语, 动名词短语或 that 引导的宾语从句。 ?4. It is necessary ( for sb. ) to do sth. ?此句型中的真正主语是不定式短语，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词，常见的形容词有：① important, necessary, natural ② easy ,
safe , common , normal , hard , difficult ,
dangerous , unusual, rare , impossible , pleasant
在①中的形容词作表语可以用从句改写，
如：It is important for her to come to the party.
= It is important that she (should ) come to
the partyIt作形式主语时的几个常见句型:?
①. It is kind ( of sb. ) to do sth. ?该句型中的不定式如果须要逻辑主语，则
须要前置介词 of, 而句型中的形容词必须是
能表示逻辑主语特征的形容词，常见的有：
bad , brave , careless, clever , cruel , foolish ,
good （好心的）, honest , horrible , kind ,
lazy , modest , naughty , nice（有教养的）,
polite, rude , silly , stupid , wise , wrong
?这个句型可以改写为：sb. is kind to do sth. ②. It takes sb. ... to do sth.?“做…要花某人…”
◆ It took me ages to repair my computer.
③. It is no good (use ) doing sth. ?该句型中的真正主语是动名词短语，主句中的表语可以是 no good , no use , no value, no importance …
◆ It’s no use crying over the spilt milk.
④. It doesn’t matter whether ( if ) ... ?＂不论（是否）…没关系…
◆ It doesn’t matter whether he is for my plan or not.⑤. It happens (seems, appears ) that...
◆ It happened that I had seen this problem in some book.
⑥. It is said (reported, learned....) that ... ? “据说”（据报道，据悉．．．）
◆ It is said that he has gone to New York to attend a medical meeting.
?⑦. It is a pity ( a shame ... ) that ...
◆ It is a pity that we have lost the match with a close score.⑧. It is important ( necessary, right, strange, natural...) that ... ?记住that 后的从句应用虚拟语气（should + 动词原形），should 可以省去．
⑨. It is suggested ( ordered ... ) that ... ?that 后的从句要用虚拟语气（should + 动词原形），should 可以省．常译为＂据建议；有命令…） ⑩. It is up to sb. to do sth.
该句型为“该由某人做…”。该句型中 up
后的to是介词。
◆ ?It is up to him to clean our classroom today. 今天应由他做教室清洁。
◆ ?It is up to parents to teach their children manners. 该由父母教孩子礼貌。 5. It is + 被强调部分 + that ... 将被强调的部分放在前面，其它部分置
于 that 之后．被强调部分可以是主语，宾
语，表语或状语．强调的主语如果是人，
that 可以由 who 换用．如果把这种句型结构
划掉后，应该是一个完整无缺的句子．这也
是与其 它从句区别判断的方法．
注意: It is not until + 被强调部分 + that ... ? 强凋“直到…才…”，需将 not 置于
until 之前It was about 600 years ago ______ the first clock with face and an hour hand was made． (NMET97，单项填空) A．that B．until C．before D．when
____computers play such an important part in our daily life? A．Why it is that B．Why is it that C．Why was it that D．Why is it BA3. It was only when I reread his poems recently ____I began to appreciate their beauty．
A．until B．that C．then D．so
4. It was how the young man had learned five foreign languages______ attracted the audience’s interest.
A. so that B. that C. what D. in whichBBGood-bye!
2. it指代时间,季节,距离.
3. it作形式宾语,常用在6123结构中.(think , find, make, believe, …)
4. it作形式主语. 当动名词,不定式,从句作主语时,常用it作形式主语.
5. It is … that….的强调句型.内容提要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。 例如：
－Who is the baby? －It’s my teacher’s son．
－Who is that gentleman?
－It’s my friend, Tom．He (不可用It) wants to see you．
【典型例题】 (NMET2001)
The Parkers bought a new house but _____ will
need a lot of work before they can move in.
A. they B. it C. one D. which B2．用于表达天气、环境、时间、距离、季节等。
◆ It’s half an hour’s walk from here to our school．
◆ It’s nice and warm here．But it’s two o’clock now, and it’s time for us to go to school．
注意下列几种表示时间的句型 ①.It is time ( about time ,high time ) that ...
◆ It’s high time that we left.
②.It is the first ( second ... ) time that ...
◆ It’s the first time that I have been praised.
③.It is .... since ...
◆ It’s three years since they got married.
④.It is / was ... when ...
◆ It was 1949 when the PRC was founded.
⑤.It is / was ... before ...
◆ It will be two years before we meet again.3. We think it important to learn a foreign language. 该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。 ?6 指主句中常用的动词：think, believe,
make, find, consider, feel； ?1 指的是形式宾语 it； ?2 指的是宾补的两种形式：形容词或名
词； ?3 指的是真正宾语的三种形式：不定式短
语, 动名词短语或 that 引导的宾语从句。 ?4. It is necessary ( for sb. ) to do sth. ?此句型中的真正主语是不定式短语，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词，常见的形容词有：① important, necessary, natural ② easy ,
safe , common , normal , hard , difficult ,
dangerous , unusual, rare , impossible , pleasant
在①中的形容词作表语可以用从句改写，
如：It is important for her to come to the party.
= It is important that she (should ) come to
the partyIt作形式主语时的几个常见句型:?
①. It is kind ( of sb. ) to do sth. ?该句型中的不定式如果须要逻辑主语，则
须要前置介词 of, 而句型中的形容词必须是
能表示逻辑主语特征的形容词，常见的有：
bad , brave , careless, clever , cruel , foolish ,
good （好心的）, honest , horrible , kind ,
lazy , modest , naughty , nice（有教养的）,
polite, rude , silly , stupid , wise , wrong
?这个句型可以改写为：sb. is kind to do sth. ②. It takes sb. ... to do sth.?“做…要花某人…”
◆ It took me ages to repair my computer.
③. It is no good (use ) doing sth. ?该句型中的真正主语是动名词短语，主句中的表语可以是 no good , no use , no value, no importance …
◆ It’s no use crying over the spilt milk.
④. It doesn’t matter whether ( if ) ... ?＂不论（是否）…没关系…
◆ It doesn’t matter whether he is for my plan or not.⑤. It happens (seems, appears ) that...
◆ It happened that I had seen this problem in some book.
⑥. It is said (reported, learned....) that ... ? “据说”（据报道，据悉．．．）
◆ It is said that he has gone to New York to attend a medical meeting.
?⑦. It is a pity ( a shame ... ) that ...
◆ It is a pity that we have lost the match with a close score.⑧. It is important ( necessary, right, strange, natural...) that ... ?记住that 后的从句应用虚拟语气（should + 动词原形），should 可以省去．
⑨. It is suggested ( ordered ... ) that ... ?that 后的从句要用虚拟语气（should + 动词原形），should 可以省．常译为＂据建议；有命令…） ⑩. It is up to sb. to do sth.
该句型为“该由某人做…”。该句型中 up
后的to是介词。
◆ ?It is up to him to clean our classroom today. 今天应由他做教室清洁。
◆ ?It is up to parents to teach their children manners. 该由父母教孩子礼貌。 5. It is + 被强调部分 + that ... 将被强调的部分放在前面，其它部分置
于 that 之后．被强调部分可以是主语，宾
语，表语或状语．强调的主语如果是人，
that 可以由 who 换用．如果把这种句型结构
划掉后，应该是一个完整无缺的句子．这也
是与其 它从句区别判断的方法．
注意: It is not until + 被强调部分 + that ... ? 强凋“直到…才…”，需将 not 置于
until 之前It was about 600 years ago ______ the first clock with face and an hour hand was made． (NMET97，单项填空) A．that B．until C．before D．when
____computers play such an important part in our daily life? A．Why it is that B．Why is it that C．Why was it that D．Why is it BA3. It was only when I reread his poems recently ____I began to appreciate their beauty．
A．until B．that C．then D．so
4. It was how the young man had learned five foreign languages______ attracted the audience’s interest.
A. so that B. that C. what D. in whichBBGood-bye!