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在英语中，我们常用It is/was（not）… who/that结构来突出强调句子的某一成分(主语，宾语或状语)。在这个句型中，it没有词汇意义，只是引出被强调的成分。如果被强调的成分是表人的词，用who或that连接都可以。如果是其它成分，则一律用that来连接。如
It is Tom who/that has broken the record. It was in this room that Tom was born.
一、在使用强调句型时须注意的几个问题：
A) 原句子是现在时或将来时，强调句用It is +被强调的部分 + that (who)…;若原句子是过去时，强调句用：It was +被强调的部分 + that (who)…
(1) Tom will work in China.---It is in China that Tom will work.
(2) I studied at this schooltwo years ago.
—It was at this school that I studied two years ago.
B) 即使被强调部分是复数，It后始终用单数形式。如
Jim and Tom gave us much help.--It was Jim and Tom that gave us much help.
C) 强调人时，可用who/ that,但若强调时间、地点、原因、方式等时，不能用
when, where, why, how，仍用that，如：It is Jim who / that helps us make progress.
It was in front of the bank that the old lady was robbed．
It was because of the heavy rain that he came late．
D）被强调成分是主语，who/that后谓语动词要在人称和数上与原句主语一致。
（1） It is I who am right．（2） It is the students who are lovely．
E）被强调成分是作主语的代词，用主格，是作宾语的代词，用宾格
It was he that helped me yesterday. It was me that he helped yesterday.
F）疑问句强调：be + it +…that+…? （一般）/特殊疑问词+be + it that+…?（特殊 ） 如：（1）Was it you who put the book on my desk?(2) What is it that made him so angry?
G）双宾语强调：无论强调哪个宾语，都必须根据动词的搭配关系，加上to或for等介词。如：原句：He gave Mary a pen.
强调直宾：It was Mary that he gave a pen to. 强调间宾：It was a pen that he gave to Mary.
（H）强调结构作宾语时要用陈述句语序。如：I don’t know where it is that he has gone.强调主语时，who或that后面的谓语形式须与被强调的主语保持一致。如：
Lily speaks Chinese very well. —It is Lily that speaks Chinese very well.
(I) 强调句型不用于强调谓语、表语、since, as等引导的原因状语从句。
二、 not…until结构中时间状语的强调：It is/was not until+时间状语+that+… 如：I didn’t go to bed until twelve o’clock last night.
---It was not until twelve o’clock last night that I went to bed.
三、反意疑问句：It was Tom that broke the door, wasn’t it?
四、强调结构的判断：去掉it is/was和that后，剩余部分(经调整后) 是否依然是个完整的句子，若是，就是强调结构，否则就不是。
It is a pity that you could not come. （不是）
It was at ten that he got home. （是）
It is Tom who/that has broken the record. It was in this room that Tom was born.
一、在使用强调句型时须注意的几个问题：
A) 原句子是现在时或将来时，强调句用It is +被强调的部分 + that (who)…;若原句子是过去时，强调句用：It was +被强调的部分 + that (who)…
(1) Tom will work in China.---It is in China that Tom will work.
(2) I studied at this schooltwo years ago.
—It was at this school that I studied two years ago.
B) 即使被强调部分是复数，It后始终用单数形式。如
Jim and Tom gave us much help.--It was Jim and Tom that gave us much help.
C) 强调人时，可用who/ that,但若强调时间、地点、原因、方式等时，不能用
when, where, why, how，仍用that，如：It is Jim who / that helps us make progress.
It was in front of the bank that the old lady was robbed．
It was because of the heavy rain that he came late．
D）被强调成分是主语，who/that后谓语动词要在人称和数上与原句主语一致。
（1） It is I who am right．（2） It is the students who are lovely．
E）被强调成分是作主语的代词，用主格，是作宾语的代词，用宾格
It was he that helped me yesterday. It was me that he helped yesterday.
F）疑问句强调：be + it +…that+…? （一般）/特殊疑问词+be + it that+…?（特殊 ） 如：（1）Was it you who put the book on my desk?(2) What is it that made him so angry?
G）双宾语强调：无论强调哪个宾语，都必须根据动词的搭配关系，加上to或for等介词。如：原句：He gave Mary a pen.
强调直宾：It was Mary that he gave a pen to. 强调间宾：It was a pen that he gave to Mary.
（H）强调结构作宾语时要用陈述句语序。如：I don’t know where it is that he has gone.强调主语时，who或that后面的谓语形式须与被强调的主语保持一致。如：
Lily speaks Chinese very well. —It is Lily that speaks Chinese very well.
(I) 强调句型不用于强调谓语、表语、since, as等引导的原因状语从句。
二、 not…until结构中时间状语的强调：It is/was not until+时间状语+that+… 如：I didn’t go to bed until twelve o’clock last night.
---It was not until twelve o’clock last night that I went to bed.
三、反意疑问句：It was Tom that broke the door, wasn’t it?
四、强调结构的判断：去掉it is/was和that后，剩余部分(经调整后) 是否依然是个完整的句子，若是，就是强调结构，否则就不是。
It is a pity that you could not come. （不是）
It was at ten that he got home. （是）