89 表示忠告或責任：should/ ought to / had better　Track 089

1）should和ought to意思相近，表示“應(yīng)該做某事”。
例句
a. You should do as you are told.
b. Drivers should / ought to obey the speed limit.
2）had better常用于口語中，后面接動詞原形，否定用had better not，含有警告或警示的意味，如：
We had better study harder, or we’ll probably fail in the exam.
我們最好學習努力點兒，否則可能會考試不及格。