1.It is (was) +被强调部分+that(who)…

为了强调句子的某一成分(通常是主语、宾语、或状语),常用强调结构:

It is (was) +被强调部分+that(who)…

表示强调的it在这种结构的句子中作主句的主语。

原始句:Last night I saw a film in the Youth Palace.

强调主语:It was I that (or: who) saw a film in the Youth Palace last night.

强调宾语:It was a fiml that I saw in the Youth Palace last night.

强调地点状语:It was in the Youth Palace that I saw a film last night.

强调时间状语:It was last night that I saw a film in the Youth Palace.

一般讲,原句的谓语动词如果是现在或将来各种时态,用It is…that (who)…;如果原句谓语动词是过去各种时态,则用It was… that(who)…。

另外,还有下面几点需要特别注意:

①在强调主语时,that后的谓语动词要与被强调者保持人称和数的一致

It is I who am a teacher.

②即使被强调的主语是复数,主句中的谓语动词也用单数

It is they who often help me with my lessons.

③在强调时间、地点、原因、或方式状语时,不要用when,where,why 或 how ,而用that

It was because her mother was ill that she didn't go with us.

④在强调not … until 结构中由 until 短语(或从句)表示的时间状语时,要用固定的强调句型

It is(was) not until ...that...。that 从句中的谓语动词用肯定式。

My father didn't come home until 12 o'clock last night.

It was not until 12 o'clock last night that my father came home.

⑤在强调一般疑问句中的某一成分时,主句要用一般疑问句的语序:即把is/ was提到it前面。

Did this happen in Beijing?

Was it in Beijing that this happened?

⑥特殊疑问句中只有疑问词可以强调,其强调结构是“被强调部分(通常是疑问代词或疑问副词)+ is/was + it + that/ who + 其它部分? "

Where were you born?

Where was it that you were born?

⑦not …until…句型的强调句

句型为:It is/ was not until + 被强调部分 + that + 其它部分

原始句:He didn’t go to bed until/ till his wife came back.

强调句:It was not until his wife came back that he went to bed.

注意:此句型只用until,不用till。但如果不是强调句型,till, until可通用;因为句型中It is/ was not … 已经是否定句了,that后面的从句要用肯定句,切勿再用否定句了。

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