not...until与强调句

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高考英语复习：not until 句型的强调句1、句型为：It is/ was not until + 被强调部分 + that + 其它部分 普通句：He didnt 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.2、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。谓语动词的强调1、It is/ was that 结构不能强调谓语，如果需要强调谓语时，用助动词do/ does或did。 Do sit down. 务必请坐。 He did write to you last week. 上周他确实给你写了信。 Do be careful when you cross the street. 过马路时，务必（千万）要小心啊！2、注意：此种强调只用do/ does和did ，没有别的形式；过去时用did ，后面的谓语动词用原形。