9 had better表示“最好”
had better 相当于一个助动词，它只有一种形式，它后面要跟动词原形。
had better do sth
had better not do sth
It is pretty cold. You'd better put on my coat.
She'd better not play with the dog.
had better have done sth表示与事实相反的结果，意为“本来最好”。
You had better have come earlier.
10 would rather表示“宁愿”
would rather do
would rather not do
would rather… than… 宁愿……而不愿。
还有would sooner， had rather， had sooner都表示“宁愿”、“宁可”的意思。
If I have a choice， I had sooner not continue my studies at this school.
I would rather stay here than go home. = I would stay here rather than go home.
- Shall we go skating or stay at home？
-Which ___ do？
A. do you rather B. would you rather C. will you rather D. should you rather
答案B.本题考查情态动词rather的用法，would rather +do sth 意为“宁愿”，本题为疑问句， would 提前，所以选B.