sothat用在表示目的结果的句子中,从句中是否一定有情态动词?

Question

so that 用在表示目的结果的句子中,从句中是否一定有情态动词?

Answer 1

So that的意思是“为了”、“俾使”、“以致”,它引导目的状语从句和结果状语从句.例：
　　They opened a technical training course so that the managers and clerks could attend it during their spare time．
　　他们开了一个技术训练班,使经理和职员们在业余的时间可以去上课.
　　Please switch the light on so that we can see what it is．
　　请开灯,让我们看一下它是什么东西.
　　During the earthquake their house fell with a crash,so that they had to find a new abode．
　　地震时,他们的房子哗啦一声倒塌了,所以他们必须要找一个新的住处.
应该有,比如can,could,have to(不得不)