高考英语语法教学课件-It的用法

这是一份高考英语语法教学课件-It的用法，共15页。PPT课件主要包含了内容提要等内容，欢迎下载使用。
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.
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：－Wh is the baby? －It’s my teacher’s sn．－Wh is that gentleman?－It’s my friend, Tm．He (不可用It) wants t see yu． 【典型例题】 (NMET2001) The Parkers bught a new huse but _____ will need a lt f wrk befre they can mve in. A. they B. it C. ne D. which
2．用于表达天气、环境、时间、距离、季节等。◆ It’s half an hur’s walk frm here t ur schl．◆ It’s nice and warm here．But it’s tw ’clck nw, and it’s time fr us t g t schl． 注意下列几种表示时间的句型
①.It is time ( abut time ,high time ) that ...◆ It’s high time that we left.②.It is the first ( secnd ... ) time that ...◆ It’s the first time that I have been praised.③.It is since ...◆ It’s three years since they gt married.④.It is / was ... when ...◆ It was 1949 when the PRC was funded.⑤.It is / was ... befre ...◆ It will be tw years befre we meet again.
3. We think it imprtant t learn a freign 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, cnsider, 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 ( fr sb. ) t d 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 imprtant, necessary, natural ② easy , safe , cmmn , nrmal , hard , difficult ,dangerus , unusual, rare , impssible , pleasant在①中的形容词作表语可以用从句改写，如：It is imprtant fr her t cme t the party. = It is imprtant that she (shuld ) cme t the party
It作形式主语时的几个常见句型: ①. It is kind ( f sb. ) t d sth.  该句型中的不定式如果须要逻辑主语，则须要前置介词 f, 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 , flish , gd （好心的）, hnest , hrrible , kind , lazy , mdest , naughty , nice（有教养的）, plite, rude , silly , stupid , wise , wrng 这个句型可以改写为：sb. is kind t d sth.
②. It takes sb. ... t d sth. “做…要花某人…”◆ It tk me ages t repair my cmputer.③. It is n gd (use ) ding 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 n gd , n use , n value, n imprtance …◆ It’s n use crying ver the spilt milk.④. It desn’t matter whether ( if ) ...  ＂不论（是否）…没关系… ◆ It desn’t matter whether he is fr my plan r nt.
⑤. It happens (seems, appears ) that...◆ It happened that I had seen this prblem in sme bk.⑥. It is said (reprted, ) that ...   “据说”（据报道，据悉．．．）◆ It is said that he has gne t New Yrk t attend a medical meeting.  ⑦. It is a pity ( a shame ... ) that ...◆ It is a pity that we have lst the match with a clse scre.
⑧. It is imprtant ( necessary, right, strange, natural...) that ...  记住that 后的从句应用虚拟语气（shuld + 动词原形），shuld 可以省去．⑨. It is suggested ( rdered ... ) that ...  that 后的从句要用虚拟语气（shuld + 动词原形），shuld 可以省．常译为＂据建议；有命令…）
⑩. It is up t sb. t d sth. 该句型为“该由某人做…”。该句型中 up后的t是介词。◆  It is up t him t clean ur classrm tday. 今天应由他做教室清洁。◆  It is up t parents t 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 wh 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 nt until + 被强调部分 + that ...   强凋“直到…才…”，需将 nt 置于 until 之前
It was abut 600 years ag ______ the first clck with face and an hur hand was made． (NMET97，单项填空) A．that　B．until C．befre　D．when ____cmputers play such an imprtant part in ur daily life? A．Why it is that　　B．Why is it that C．Why was it that　 D．Why is it