爱华网It is／was＋．．．who／that强调句型使用频率很高，高考也很注重对它的考查，但该句型结构复杂，变化多样，在实际使用过程中很有难度。本文通过以下几个方面对强调句型进行较为全面的考察。
一、如果强调句型指现在或未来情况用It is，指过去情况用It was。
It was I that spent my first 18 yearsin Anqing.
It is I that spend my first 18 yearsin Anqing.
二、被强调部分往往是句子的主语、宾语、时间状语和地点状语，但有时也可强调比较复杂的内容，如时间状语从句、条件状语从句、not until．．．、not only．．．butalso．．．、．．．as well as．．．等结构。
(2007年重庆) It is not who is right but what isright __ is of importance.
A.whichB.itC.thatD. this
解析：句意：重要的不是谁对而是什么是对的。任何强调句都可以通过删除It is / was...that...来还原成非强调句。本句可以还原为Not who is right but what is right isof importance.本句因使用了not...but...（不是．．．而是．．．）所连接两个并列的主语从句使题目的难度加大了很多．本题正确答案是C.
三、被强调部分是人称代词时，原句用什么格，强调句也用什么格。
It was I that spentmy first 18 years in Anqing. ( )
It wasmethat spent my first 18 yearsin Anqing. ( )
解析：强调句型中的被强调部分只要从原句中照搬过来就行，不要改变原句中主宾格，时态和数．作题时可以试图通过把强调句转换成非强调句来判断．
四、关于强调词的选用，强调人时可用who或that；如果不强调人一律用that。此时绝不能和定语从句混淆，被强调部分为时间状语、地点状语或者原因状语时不能误用when、where或why。
It was him who／that I saw the day beforeyesterday．
解析：该句原句为：I saw him the daybeforeyesterday．该句指过去情况，所以强调句型应使用It was开头；被强调部分为原句宾语—宾格人称代词him，所以强调句型仍用him作被强调部分；被强调部分指人，所以用who或that。
It was in the street that I methimyesterday．
解析：该句原句为：I met him in thestreetyesterday．该句仍指过去情况，所以强调句型仍以It was开头，被强调部分虽为地点状语，但不能用where，只能用that。
It was because he was seriouslyill that he died．
解析：该句原句为：He died because hewas seriouslyill．被强调部分为结构复杂的原因状语从句，但不能用why，只能用that。
五、强调句型的一般疑问句结构为：Is ／Was it…who／that…？
Was it during the Second WorldWarthat he died？
解析：该句虽不以It was开头，而以Was it开头，是强调句型的一般疑问句形式。所以当被强调部分为时间状语时，应用that。
六、强调句型的特殊疑问句结构为：特殊疑问词＋is ／was it that…？（强调句型的特殊疑问句只能强调特殊疑问词）
Where was it that you found yourlostpen？
解析：该句虽以Where开头，但后边的was it仍说明该句使用的是强调句型，被强调部分为特殊疑问词where，表地点，所以应使用that。又如：
When was it that yougot to know each other.
七、强调句型中的is ／was前面可用must ／may ／might等表推测的情态动词。
It might be inthis room that he mether．
解析：该句It was的was前面虽用might，但该句仍然是强调句。
八、被强调部分为时间状语和地点状语时，有可能先接定语从句，再接强调句型，应多加思考，不能混用。
It was on October1st，1949 when he joined the Party that hewas killed．
解析：该句的中心不是说明1949年10月1日他入党，而是说1949年10月1日他被杀害，he joined theParty是定语从句，所以，首先是when引导的定语从句，然后是that强调句。又如：
It was in the place where the boysplayed thathe found thetextbook.
It was an old lady who opened thedoor when we knocked at it.
(2007 江西，３４) I do not know her criticizing me, but___ is how she does it thatI objectto.
A.itB.thatC.thisD.which(A)
解析：句意，她批评我我不介意，但是我不赞同她批评我的方式．本题考察强调句．强调对象是宾语从句how she does it.本句还原成非强调句后结构就更加清晰了：I object to how she does it(=I objectto the way she criticizes me).
九、判断强调句型的使用是否正确的方法是将强调结构去掉，如果去掉强调结构后的句子仍然完整正确，强调句型就正确，否则就不正确。
It was six years ago that he wenttoTokyo．
解析：该句强调句型使用正确，因为去掉强调结构后，该句仍然是一正确句子。即：Six years ago he went toTokyo．这是处理强调句的一种非常有效且简便的方法．
十、＂not...until...＂句型的强调.强调until 短语或until 从句时，需要将原主句中not 与until 放在一起．做这类题时不能简单地将强调句还原成非强调句了．
It was not until they finished allthe exercises that the students left school. （原句：The students did not leave schooluntil they finished all the exercises.）
(2007 浙江，１０) It ___ we had stayed together for acouple of weeks ___ i found we had a lot in common.
A. was until;when B. wasuntil; thatC. wasn't until;whenD. wasn't until;that(D)
十一、使用省略结构．此时强调句更容易和定语从句和状语从句混淆了．
－－－ When did you come back home lastnight?
－－－It was at about midnight ____it was beginning to rain.
A.whenB.whereC.whatD.that(A)
解析：本题就是强调句的省略．题中when 引导的是修饰midnight的定语从句．完整的句子应该是It was at about midnight when it wasbeginning to rain that we came back home.又如今年山东省的高考题：
30．---Where did you get to knowher?
---It was on the farm_____we worked. 『2007 山东』
A．thatB．thereC．whichD．where(D)
解析：It was on thefarmwherewe worked.= It was onthe farm where we worked thatI got to knowher.
本文来自http://blog.163.com/zhuxz789@126/blog/static/290492082007102411947106/
