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关于英语强调句(新概念3册21课)It is...that..

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关于英语强调句(新概念3册21课)It is...that..
老师给的语法是It is/was...that ...没听懂 形式主语的be动词的时态与原来的句子时态是什么关系,It was怎么变?
二.强调句的人称,时态,数的运用.
强调句的时态依原句而定.
原句的时态为过去的某种时态,
则强调句中的be就用过去时
was.
原句为现在的某种时态,
强调句中就用be的现在时态.
有时还可用It might be/must have been/can’t be ...that...
等句型.

It is Jack who loves football most.(is 与loves时态一致)
It was because I was stuck in the traffic that I came
late(was 与came时态保持一致)
It might be tomorrow morning that the news will be broadcast.
Tips:
被强调部分为主语时,
that/who后面的谓语动词在人称和数上应和句子的主语相一致.如:
It is I that/who am your friend that hill come to help you.