2．should
①表示义务，意为“应该”（某件事宜于做），用于各种人称。
Children
should obey their parents.
儿童应该服从他们的父母。
One
shouldn't be selfish.
人千万别自私。
Customers who get bad service should complain, shouldn't they
没有得到满意服务的顾客应该抱怨，不是吗？
②常与what, how, why等词连用，表示意外、惊讶等情绪。
How
should I know
我怎么会知道呢
Why
should I fear
我为什么会害怕？
What
should she do but cry for help
除了呼救外，她还能干什么？
I don't
know why you should think I did it.
我真不知道你凭什么认为这件事是我干的。
③表示对过去、现在或将来情况的某种推测，可译为“可能、照说应该”。
It
should be fine tomorrow.
明天可能天是晴天。
He
should be taking a bath now.
他可能在洗澡。
It's
nearly seven o'clock. Jack should be here at any moment.
已经快七点了，杰克随时都可能到这儿。
The film
should be very good as it is starring first-class actors.
这部新电影是一流演员主演的，估计拍得很好。
④表示对现在或以前的动作的责怪、批评（应做的事却没做）。
The boys
shouldn't be playing football. They should be at school.
这些男孩子不应该在踢足球，他们应该在上课。
You
shouldn't have entered the teachers' office without permission.
没有允许你们不应该进老师办公室。
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