摘要:5.用于强调句型.即“It is/was+被强调部分+that/who/whom+其它 句型之中. 使用该句型有以下几点请注意: ① 强调句的谓语is或was永远用单数. It was yesterday that I met your father in the street. ②不管被强调部分是哪种状语.只能用that连接.不得使用where.when等连词. It was in the street that I met your father yesterday. ③被强调部分为人时.可用who和whom代替that.用that也行. 1) It was your father that/whom /who I met in the street yesterday. 2) It was I that/who met your father in the street yesterday. ④强调句中 也要注意主谓一致.人称一致和否定转移的问题. 1) It is they who are our friends. 2) It was not until ten o'clock that we got home last night. ⑤注意不要混淆强调句和其他从句.It is was-that-为强调句标志.去掉后仍可组成一个完整的句子.只是没被强调,而其他从句一般不具备这一特征. 比较: 1) It was ten o'clock when we got home last night.我们昨晚到家时已十点了. 2) It was at ten o'clock that we got home last night.我们昨晚是在十点到家的. 第一句不是强调句.when不可改为that,因为去掉it was和that后.只能组成“We got home ten o'clock last night. 这样一个不完整的句子,第二句是强调句.that不可改为when.

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