had better用法大全
1. 意思是「應該；最好」;
You had better study hard for your entrance exam.
You had better see the doctor about your cough.
2. 後接不帶 to 的不定式：had better do sth;
you had better be careful.
It’s five o』clock. I』d better go now before the traffic gets too bad.
3.其用法相當於情態動詞，動詞 had 沒有人稱或數的變化。
She』d better get here soon or she』ll miss the opening ceremony.
4.常用來提出建議，語氣較強，我們一般強調如果不這樣做會有不好的後果。
或表示迫切的希望，警告等。
We'd better take something to eat or we will be hungry later.
You had better lock the door before you leave.
You had better unplug the toaster before you try to clean it.
The movie had better end soon. (hope)
They had better be here before we start dinner. (hope)
My team had better win tonight. (hope)
You'd better shut up! (warning)
5. 該短語指的是現在或將來的情況，而不指過去。
You'd better take an umbrella or you will get wet.
I think I had better take them or they will get lost.
6. had better的簡略式為：'d better 。口語裡had也常常被省略。如：
It’s five o』clock. I』d better go now before the traffic gets too bad.
you better not come tonight.
I'd better go to bed, I have to be up early tomorrow.
It's getting late. You'd better leave now or you will miss your bus.
7. had better的否定是had better not；疑問式是將 had 放在主語之前。如：
They had better not be late.
They had better not forget Tom's birthday gift.
You』d better not tell Elizabeth about the broken glass – she』ll go crazy!
I』d better not leave my bag there. Someone might steal it.
Had we better leave a note for the delivery guy to take the parcel next door?
Hadn’t we better ring the school and tell them Liam is sick?
例句摘自《牛津字典》等網絡資源！