had better的意思是（用于建議、警告、威脅、發(fā)表意見等）最好。had better加動(dòng)詞原形，had better do sth最好做某事。 

had better的用法

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。

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、主語不論是第幾人稱，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)在最好聽收音機(jī)。

You had better be quiet.你最好安靜一些。

2.had better用于指將來。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.我們最好還是買貴些的,它更經(jīng)久耐用，所以到頭來，它還是更便宜些。

3.had better用于進(jìn)行式，表示講話人提出建議時(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。