2. If it should rain tomorrow, I wouldn’t go out.(与将来相反)
3. She insisted that we (should) stay.
4. His order is that we (should) do that at once.
三、表示“推断”， 作“可能、应该、会是”等。
1.Let me know if you should hear some more news?
2. I told Sally to fix him up with his job, but perhaps I should have written it out for her.
3. I felt sure that we should meet again.
4. The effect of tax should be felt in higher prices.
四、表示“应该、应当”，比must预期稍弱，同义词为ought to。
1. Everyone should know some first aid.
2. You shouldn’t move if you are badly hurt.
3. Elder brothers should take care of their younger brothers and sisters.
五、表示客气和委婉的语气。
1. I would be very grateful if you should let me know about it.
2. I should say that you have done much to me.
六、表示“责备”或“后悔”。
1. I was really anxious about you. You shouldn’t have left home without a word.(责备)
2. I shouldn’t have said such a thing.（后悔）
七、表示“吃惊”，作“居然、竟然、不以为然”讲。
1. Why should any object to her enjoying herself?
2. I can’t think why he should have been so angry.
3. When I was going out of the store, who should I meet but my former classmate!
4. How should I know?
八、用于一些固定结构中。
1. I should… 如果我是你2我就会……
2. I should like… 我想…… （做某事）
3. I should have thought… 我还以为…… （表示惊奇）
4. I should think…. 我看（想）……]
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