常用句式
(1)基本形式:
If + do\does, ... shall\will ...
If + do\does, 后接祈使句
(2)变体形式:
If + should 表示不太肯定,猜测
If + will 表示意愿
If + would 表示客气请求
(3)替换形式:
Get up, and you won't be late 可转换成 If you get up, you won't be late.
真实条件句
表示客观真理: If + 一般现在时,主句也用一般现在时
表示习惯动作:常用的主将从现
表示过去习惯:If + 一般过去时,主句也用一般过去时
非真实条件句
(1)基本形式:If + did\were, ... would ...
(2)变体形式:
表示假设 If + were to, ... would ...
表示不太可能实现 If + would do, ... would ...
(3)与过去事实相反:
基本 If + had done, ... would\could\might\ have done ...
变体 If + were to have done, ... would\could\might have done ...
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