should 的用法I should be obliged if you would send them to me.if he should come ,give him this lettershould ministers decide to instigate an inquiry,we would welcome it.三句中should的用法?

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should 的用法
I should be obliged if you would send them to me.
if he should come ,give him this letter
should ministers decide to instigate an inquiry,we would welcome it.
三句中should的用法?

四种:
1.应该:用来表示义务或职责:
You should send her a note.
你应该给她留一个条
2.用于表示可能性或期望:
They should arrive at noon.
她应该在中午到达
3.用于表示可能性或可能发生的事件:
If she should fall, then so would I.
如果她失败了,那我也会失败
4.用于使一个直接或直率的陈述变得婉转:
I should think he would like to go.
我倒是认为他愿意去