同学你好，该知识点来自沪江网校《【Uni智能】英语零基础直达大学四级【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
so that 意思是  以便; 结果，以致
[例句]   They may be able to help with childcare so that you can have a break
他们可以帮忙照料孩子，这样你就可以歇一歇了
so that 用在句中，意思不符   原句说的是 等他走进了，我问他……

连词before表示主句和从句的动作顺序时，过去完成时可以用于主句，也可以用于从句，意义相同。例如：
Before he entered the institute, he had served in the army.
Before he had entered the institute, he served in the army.
以上二句意思相同。
如果before从句用一般过去时，则主句用一般过去时或过去完成时均可，意义相同。
The concert had started before we got to the hall.
The concert started before we got to the hall.

祝学习愉快哦