关于一个英语句子.有哪些语法点、知识点?

1.这个句子的基本结构是 Do sth.or you'll.意思为“做某事,否
则...”eg.Study hard or you 'll fail the exam.
这个句型也可写成“Do sth.and you'll...” 意思为“做某事,你就
会...” eg.Study hard and you'll pass the exam.
2.so that 引导目的状语从句,eg.She got up earlier so that she could catch the first bus.
3.before 引导时间状语从句.
4.词组有：keep doing 一直做某事

Keep looking ahead so that you can give the driver lots of warning before having to make a turn,or you 'll have to move to the back seat Keep looking ahead为前半句主体 很单纯的句子没啥重要的知识点

keep doing
so that
介宾结构before
or结果状语从句

首先，翻译一下，一直向前看，你就可以在不得不调头之前给司机许多提示，不然你就要移到后面的座位去。
句子整体框架是祈使句＋or＋陈述句，相当于if …not …, ＋主句，相当于一个条件状语从句
so that 引导结果状语从句
keep doing 一直做
have to do 不得不做
before doing 在做…之前
其他没什么，只是长而已...