老薛侃英语语法84：条件状语从句

老薛 老薛讲英语 2019-07-09 14:13

条件状语从句就是表示条件的状语从句，其连词主要有：if, unless, suppose, supposing (that), assuming (that), providing (that), provided (that), in the event (that), given (that), on condition (that), as (so) long as 等。

条件状语从句分为非真实条件句（即虚拟语气，见第40讲）和真实条件句。本讲仅涉及真实条件句。举例：

If the weather is fine tomorrow, we shall go to the country. 如果明天天气好，我们就到乡下去。

He won't finish his work in time unless he works hard. 除非他努力干，否则不会及时完成工作。

Provided (that) there is no opposition, we shall hold the meeting here. 如果没有人反对，我们就在这里开会。

注意：如果主句动作和从句动作都发生在将来，主句用将来时，从句则用一般现在时。