(二)not … until … 句型的强调句
1、句型为:It is/ was not until + 被强调部分 + that + 其它部分
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。
二、It的用法
(一)作人称代词
1、it代替前面(或后面)的单数名词或分句等所表示的事物。
e.g. You cannot eat your cake but have it.(it代替前面的cake)
Although we cannot see it, there is air all around us. (it代替后面的air)
They say he has left town, but I don't believe it. (it代替前面They…town分句中的情况)
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