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在that子句中，should表示惊讶、意外、必须、遗憾等。

It's necessary that you should review your lessons before the examination.

考试前你复习功课是有必要的。

It's a pity that Teresa should have died so young.

Teresa那么年轻就死了，真是太遗憾了。

I'm surprised that a careful man like him should have made such a mistake.

想不到像他那么谨慎的人居然犯那种错误。

should用在suggest, ask, order, insist等子句中(这些动词通常指应采取某种行动或应完成某种要求)

I asked that they (should) make a reservation in advance.

我要求他们事先订位。

The doctor suggested that my father (should) lose some weight.

医生建议我爸爸应该减轻体重。