1、is,was,两种“be”的选择要视原句谓语动词的时态而定1.It _ Mike and Mary who helped the old man several days ago.A.was B.is C.were D.had been,二、“两种be和两个一致”,_,A,温馨提示：强调句型中的be动词和情态动词的结合。句式结构:It may be+被强调部分+that It must have been+被强调部分+that Could it be+被强调部分+that?,e.g.It might have been John _bought a new book for Mary yest
2、erday.A.what B.since C.that D.then,C,2.两个一致：主谓一致、主宾一致。,强调句在强调主语时,that/who后的动词应和主语在人称和数上保持一致.It is he who _ late.It is they that _ late.A.am B.is C.are D.be 强调主语用人称代词主格;强调宾语用宾格.It is _who are your best friends.It was _ that they visited.A.we B.us C.our D.ours,A,B,B,C,三、“三个连接词和三类强调成分”,1.当被强调部分指人时，可用th
3、at/who（做宾语时可用whom）；指物或既有人又有物时只用that;,2.强调状语时,It is at 5 oclock the train will arrive.It was in the park I saw Kate last week.,只用that,不用when,where,why.,It was Tom I met last week.It is a new book his brother wants to buy.,Who/that/whom,that,that（不用when）,that（不用where）,注意：It iswasthat强调句型的被强调部分如果是原因状语从
4、句，只能由because引导，不能由since、as或why引导。,It was because he was ill that he didnt come to school yesterday.,四、“四种句式变化”即一般疑问形式、特殊疑问形式、感叹句形式、省略句形式。（一）一般疑问形式,句式:,Is（was）it+强调部分+that?,e.g.He will leave for Hong Kong at 7:00.,It is at 7:00 that he will leave for Hong Kong,Is it at 7:00 that he will leave for Hon
5、g Kong,（二）特殊疑问句形式 句式结构：e.g._ is it _has made Peter success.A.What;that;B.That;what;C.What;D.That;,特殊疑问词+is/was it that？,简析：It is determination that has made Peter success.,What is it that has made Peter success.,（三）感叹句形式 What/How.it is/was（that）+主语+谓语 What a beautiful picture it is（that）you have dra
6、wn!你画了多漂亮的一幅画呀！,（四）省略句形式,Who is making so much noise in the garden?the children.A.It is B.They are C.That is D.There are（回答为强调句型在具体语境中的省略，其完整形式应是：It is the children who/that are making so much noise in the garden.不能用They are.）,五、“五类复杂化结构”,（一）与宾语从句结合e.g.David said that it was because of his strong in
7、terest in literature _ he chose the course.A.that B.what C.why D.how（A.强调句型,It is.that.作said的宾语从句，其中强调成分为原因状语。）,即强调句型与宾语从句、主语从句、同位语从句、定语从句和时间状语从句（not.until）相结合，加大了句子结构的复杂程度和句意理解的难度。,_,（二）与主语从句结合,A.重要的是你所做的，而不是你所说的。（主语从句为所强调的成分）,It is what you do rather than what you say _matters.A.that B.what C.whic
8、h D.this,.,（三）与同位语从句结合,e.g.It was at the very beginning _ Mr.Fox made a decision _ we should send for a doctor.A what,that B that,which C which,that D that,that D.强调句式中连接词that后有一个同位语从句，它对decision作解释说明。连结词在同位语从句中不做成分只起连接作用，故应为that.,（四）与定语从句结合,e.g.Was it in the village _ we used to live in _ the accid
9、ent happened?A.where,that B.which;thatC.that;where D.where;which,A,（五）.notuntil句型的强调句句式：It is/was not until+被强调部分+that+其他成分.e.g.He didnt go to bed until ten o clock.It was not until ten o clock that he went to bed.1.It _ we had stayed together for a couple of weeks _ I found we had a lot in common.A
10、.was until;when B.was until;that C.wasnt until;when D.was t until;that,温馨提示：在和时间状语从句连用时应和以下句式区别，它们中的连接词不能用that。,1）It be+时间段+since.句型。如since和延续性动词连用意为“某人不做某事已有多久”（行为的终止）；和短暂性动词连用则表示“某人做某事已有多久”（行为动作的开始）。e.g.Its three years since we met last time.Its two years since he smoked.,自从我们上次相见已有3年了。,他戒烟有2年了。,2
11、）It be+时间+when.句型。when引导的为时间状语从句,表“某事发生时正是时候”。注意时间词语前无介词，主从句时态一般应是一致的。e.g.It was midnight when he got home yesterday.昨天他到家的时候已是半夜。（when引导的为时间状语从句,it为代词,指时间.）比较：It was at midnight that he got home yesterday.他昨天是半夜到家的。（本句为强调句，强调at midnight，去掉it was及that 句子结构仍完整.）,3）It was/will（not）+时间段+before.肯定句中表“过了
12、之后某事才发生”；否定句中意为“不久就”。It was some time before we realized the truth.It wont be long before we know the result of the experiment.,好久之后我们才了解到真相。,不久我们就会知道试验的结果。,（1）It was three hours ago _ he left here.（答案:that，强调句型）（2）It was three oclock _ he left here.（答案:when，时间状语从句）（3）It is three hours _ he left here.（答案:since，时间状语从句）（4）It wasnt long _ he left here.（答案:before，时间状语从句）,解题法：删除法 缺什么用什么,用that,before,when,since完成句子,
