主语+had better do sth 有以下2种解析
(1)向对方提出做某事的建议
You had better go home and rest up a little.
你最好回家休息一下.
It's half past two. I think we had better go home.
现在两点半了。我想我们最好还是回家吧。
(2)威胁/命令/警告对方做某事
He had better cut out the nonsense.
他最好停止胡说八道。
You had better take out all your money.
你最好把所有的钱拿出来。
主语+should do sth
I should exercise more.
我应该多锻炼一些。
All visitors should register with the British Embassy.
所有游客都必须到英国大使馆登记。
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