A must,ought to和should可用来表示劝告:
You must read this book.Its marvellous.
你该读一读这本书。这本书非常好。
You should grow your own vegetables.
你应该自己种菜吃。
You ought to plant some trees.
你应当种几棵树。
在间接引语中 must,ought to和should可以不发生变化,或用advise+ 宾语结构来转述:
He advised me to plant trees.
他劝我种树。
B you had better +不带to的不定式(参见第120节):
Youd better take off your wet shoes.
你最好把湿鞋子脱掉。
Youd better not wait any longer.
你最好不要再等了。
had better可用于第三人称:
Hed better stop taking those pills.
他最好别再服用那些药片。
C if I were you I should/would:
If I were you Id buy a car.
如果我是你,我就买一辆汽车了。
这种形式常常被缩略为I should/would,I稍加重音:
Id buy a car.
(译文同上。)
在间接引语中 If I were you I should/would由advise+宾语结构来转述:
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