if, unless (=if ... not), so/as long as (只要), on condition that (条件是), if only (=if), provided that (如果), in case (万一,如果), suppose/supposing that (假设,如果), assuming that等均可引导条件状语从句。
①We will have a picnic in the park this Sunday unless it rains or it's very cold.
除非下雨或天很冷,否则我们将在本周日去公园野餐。
②My parents don't mind what job I do as long as I am happy.
我的父母不在意我从事什么工作,只要我高兴就好。
2.条件状语从句的时态
在条件状语从句中,常用一般现在时表将来含义;现在完成时表即将完成之后的情况;一般过去时表过去将来的含义。
If everyone does his part, the project will surely be a success.
如果大家都尽责,这个项目肯定会成功。
(三)让步状语从句
1.although, though, while引导的让步状语从句。
Though/Although/While regular exercise is very important, it's never a good idea to exercise too close to bedtime.
尽管有规律的锻炼很重要,但临睡前锻炼不是个好主意。
2.as, though引导的让步状语从句需用部分倒装语序。
Hot as/though the night air was, we slept deeply because we were so tired after the long journey.
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