had better基本特点有哪些
1、其后接不带to的不定式，表示目前或以后的定义，如：
You had better sit here and have a rest. 你最好在此坐坐休息一会儿。(目前)
He had better stay in bed tomorrow. 他最好明天卧床休息。(以后)。
2、当其后接 have 加过去分词时，表示过去定义，如：
He had better have stayed in bed as I suggested. 他最好接纳我的建议卧床休息。(但他没卧床休息)
You had better have had tea,but you asked for coffee. 你最好喝茶，但却你要了咖啡。
3、had better 的否定式是在其后加not，如：
You had better not say it again. 你最好不要再提那件事了。
She had better not tell lies any more. 她最好再也别说谎了。
4. had better 的疑问句是把had提前
The doctor had better see him.
Had the doctor better see him?
Who had the doctor better see?
had better 后接进行式和完成式动词
有时后接动词的进行式，表示最好立刻做某事;也可接完成式动词，表示最容易做完某事或本该做某事而未做某事：
I think Id better be going.我想我最好还是立刻走。
Youd better be getting your clothes ready. 你最好立刻把衣服筹备好。
You had better have done that. 你最好把那事做完。
You had better have stayed here. 你本来应该呆在这儿的。
had better的什么时间使用方法说明
(1) had better 用于提出建议或请求时，并非一个非常客气委婉的表达，它暗示他们有义务去做某事，因此一般用于长辈对晚辈或上级对下级等，而不适合反过来用。
(2) had best与had better使用方法和含义均差不多，但不如had better普通：
You had best get home before midnight.你最好在午夜之前回到家。
We had best be going.大家最好目前就走。
(3) 有时可省略其中的had：
You better sTOP arguing.你们最好不要争论了。
Better not wait for him. 最好不要等他了。
Better say yes, if they ask you. 假如他们问你，你最好说是。
(4) 有时为了强调，可将better置于had之前：
I promise Ill pay you back. You better had. 我保证还给你。你最好还给我。
