Had better 这个词组意为“最好还是……；还是……好；最好……”，用于劝解或间接命令。其用法如下：
1. had better 后可接不带to的不定式，即had better do sth. ,意指现在或将来，不指过去。Had better do sth 是个固定结构，用于各种人称和数；尽管该结构中有better 一词，但整个结构并无比较之意，如：
you had better practise your spoken English every day.
You had better do it at once.
We had better go swimming tomorrow.
注意：
1)如果要表示过去，可用had better后接不定式的完成式的形式，即had better have done sth. 此种结构表示在说话之前最好该做某事而事实上却没有做，带有后悔.遗憾或委婉责备之感情色彩。这时可将其译为“要是……就好了”。如果不定式完成式成为否定结构。即had better not done sth. 则其意为“要是不曾…….就好了”或“最好不曾…….”。如：
You had better have done that.假如你把那桩事办了就好了。（但事实上并未办）
You had better not have done so.你最好不曾这样做。（但事实上已做了）
2)另外，had better之后还可接不定式的进行时，即had better be doing sth.此种结构通常表示将来，并表明做某事的紧要性，带有心情迫切的感情色彩。如：
You had better be preparing your lessons.你最好立即准备功课。
I had better be going to see her.
2.had better的否定式是将not 放在better 之后，即had better not do sth.如：
We had better not begin just yet.我们最好现在先别开始。
You’d better not wake me up when you come in.你进来时最好不要弄醒我。
3.had better的疑问式是将had提到主语之前，即had＋主语＋better＋do sth。 ＋其他成分？其否定疑问式可用had＋主语＋not better＋do sth. …？或hadn’t＋主语＋better＋do sth….? 如：
What had we better do next? 我们下一步最好怎么办？
Hadn’t you better make haste? 你最好快点好不好？
Had I not better take him upstairs and let him lie down a little? 我最好把他带到楼上让他躺一会儿，对不对？
4.had better若用于反意疑问句时，其后的简略疑问式应用“hadn’t＋主语”。如：
you had better have a rest hadn’t you?
5.had better 用在宾语从句形式不变。如：
She told me that I had better buy a new bike.
I think that you had better study hard.
6.had better之后还可接不带to的不定式的一般式被动结构，表示句子的主语是不定式所表示动作的承受者。如：
That foolishness of yours had better be stopped. 你这愚蠢的行为应该停止了（你可别再干蠢事了）。
7. had better的had常以缩约式‘d和主语合写在一起，在非正式语体中，有时干脆将had省去而不用，甚至在句子意思清楚时，将had连同主语一起省掉。如：
You’d better go to see a doctor immediately.
You better not waste your time.
Better study hard or you’ll fail again.
8.为了强调，better可以置于had之前。如：
“I promise I’ll pay you back.” “You better had.”
“我答应把钱还给你。”最好如此”
9.had best是had better的进一步加强语，用法与had better同，因为有些俗语气味，不大常用。如：
I had best start for home.我最好还是动身回家吧。
Had better: + do sth.
意思为：最好做某事，good的比较级
eg.We had better go before the storm becomes worse.
在暴风雨更大之前我们最好就走