③ 强调地点状语：It was at the railway station that I met Li Ming yesterday.
④ 强调时间状语：It was yesterday that I met Li Ming at the railway station.
⑤注意：构成强调句的it本身没有词义；强调句中的连接词一般只用that、who，即使在强调时间状语和地点状语时也如此，that， who不可省略；强调句中的时态只用两种，一般现在时和一般过去时。原句谓语动词是一般过去时、过去完成时和过去进行时，用It was…，其余的时态用It is…
not … until … 句型的强调句
⒈ 句型为：It is/ was not until + 被强调部分 + that + 其他部分
如：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.
⒉ 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
⒈ 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.
如：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!
⒉ 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。
