同学你好，该知识点来自沪江网校《零基础直达BEC商务英语高级【签约 全额奖学金班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

备注：
（1）上表中would都可转换为should、could、might。
（2) 如果为时间错综句的话，左右两栏可互相搭配，排列组合。

同学你好，该知识点来自沪江网校《零基础直达BEC商务英语高级【签约 全额奖学金班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好
if引导的非真实条件句——表示的是假设的或实际可能性不大的情况）与..事实相反
If从句 主句搭配
过去 Had done Would have done
现在 Were/did Would do
将来 Should do/were/were to do   Would do
例句：If there hadn’t been much rain in spring, we would have had a good harvest now. [过去]如果春天没有那么多雨，我们现在就会有个好收成。
If he smoked less, his cough might be well soon. [现在]如果他少吸点烟，他的咳嗽现在可能很快就好了。
If the lecturer should be late, you would have to make a speech first. [将来]如果主讲人来迟了，你将第一个演讲。
祝学习愉快！