had better(常簡(jiǎn)略為'd better)是一固定詞組,had better"最好",用于表示對(duì)別人的勸告、建議或表示一種愿望.其用法有以下幾點(diǎn)：
一、had better后面必須跟動(dòng)詞原形.
had better后跟動(dòng)詞原形(即不帶to的不定式),構(gòu)成had better do sth.句型.
這里的had不能用have來(lái)替換.如：
You'd better go to hospital at once.你最好立即去醫(yī)院看病.
Tom,you'd better go there today.湯姆,你最好今天去那兒.
二、主語(yǔ)不論是第幾人稱(chēng),句子不論是什么時(shí)態(tài),都要用had better的形式.如：
Now you(he,we) had better listen to the teacher.你(他,我們)現(xiàn)在最好聽(tīng)老師講.
三、had better可用于的時(shí)態(tài).
1.had better用于指現(xiàn)在.如：
Now you had better listen to the radio.你現(xiàn)在最好聽(tīng)收音機(jī).
You had better be quiet.你最好安靜一些.
2.had better用于指將來(lái).如：
You had better start tomorrow.你最好明天動(dòng)身.
We had better buy the more expensive one.It will last much longer and so it will be cheaper in the end.我們最好還是買(mǎi)貴些的,它更經(jīng)久耐用,所以到頭來(lái),它還是更便宜些.
3.had better用于進(jìn)行式,表示講話(huà)人提出建議時(shí),動(dòng)作正在進(jìn)行.如：
We had better be watching the TV play.我們最好現(xiàn)在就看到電視劇.
We had better be starting back now.我們最好現(xiàn)在就動(dòng)身回去.
4.had better + have + V-ed可表示"本該做而沒(méi)有做的事".如：
You had better have done it .如果你把那件事辦妥就好了.(但實(shí)際上你沒(méi)有那樣做)
You had better have stayed with us .要是當(dāng)時(shí)你和我們呆在一起多好啊.(實(shí)際上沒(méi)有)
四、had better的否定式.如：
常用的否定形式是將否定副詞not直接放在had better的后面.如：
You had better not miss the last bus.你最好不要錯(cuò)過(guò)末班公共汽車(chē).
You had better not leave for Nanjing the day after tomorrow.你最好后天不要?jiǎng)由砣ツ暇?
注意：否定副詞not絕不能放在had的后面.如：不能說(shuō)：You hadn't better go.而應(yīng)該說(shuō)：You had better not go.
五、had better的疑問(wèn)式.
had better通常不以普通疑問(wèn)句的形式出現(xiàn).但有時(shí)用于否定疑問(wèn)句,常用Hadn't+主語(yǔ)+better...結(jié)構(gòu),作為一種勸告形式,比肯定形式的語(yǔ)氣更婉轉(zhuǎn)一些.如：
Hadn't you better take an umbrella?你不認(rèn)為該帶一把傘嗎?
Hadn't you better ask him first?你不認(rèn)為該先問(wèn)問(wèn)他嗎?
六、had better在反意疑問(wèn)句中.
在反意疑問(wèn)句中,疑問(wèn)部分一般用"had+主語(yǔ)?",但有時(shí)可用"will you?"表示一種請(qǐng)求或建議.如：
You'd better not go out today,had you?今天你最好不要外出,好嗎?
I must stay at home this afternoon.You had better come to my house,will you?今天下午我必須留在家里,你最好來(lái)我家,好嗎?
七、在祈使句中,had有時(shí)可以省略.如：
Better not do it .最好別做那事.
Better not wait for them.最好不要等他們.
八、had better的被動(dòng)式.
You had better do it.->It had better be done.
You had better have done it.->It had better have been done.
九、had better在間接引語(yǔ)中的用法.
在直接引語(yǔ)變?yōu)殚g接引語(yǔ)的過(guò)程中,had better同第一人稱(chēng)或第三人稱(chēng)連用時(shí),保持不變；had better同第二人稱(chēng)連用時(shí),可以保持不變,也可用advise+賓語(yǔ)+不定式(賓補(bǔ))來(lái)表示.如：
He said,"Ann had better hurry."->He said (that) Ann had better hurry.
He said," I had better hurry."->He said (that) he had better hurry.
He said to me," You had better hurry." ->He said (that) I had better hurry.->He advised me to hurry.
十、had better在表示對(duì)別人勸告、建議時(shí),不宜用于與陌生人、長(zhǎng)輩及上級(jí)的交談中.
對(duì)長(zhǎng)輩說(shuō)話(huà)時(shí),最好不用had better.比較有禮貌的說(shuō)法是：It might be better for you...；
It would be better for you.如：
It might be better for you to help me,Grandpa.爺爺,您最好能幫我一下.
[練習(xí)]
下列各句都有一處錯(cuò)誤,請(qǐng)改正.
1.You'd better to wait for me at the school gate.
2.I have better write to him now.
3.You had not better go there.
參考答案：1.去掉to.2.have應(yīng)改為had.3.將not置于better后面.