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　　二、not … until … 句型的强调句

　　1. 句型为：It is/ was not until 被强调部分 that 其他部分

　　e.g. 普通句：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.

　　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。

　　三、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.

　　e.g. 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。