would 和should的区别，什么时候用would?什么时候用should?

第一人称时表自己主观意愿时多用should，其他人称时，表示他“应当”那样时，多用should，其他表示非主观意愿，以及客观要求时，多用would

right.

虚拟语气的表达形式是通过动词的变化形式表达的， 其特点是主从句时态的不一致， 而且一般有明显得标志。具体如下：
一：if 句型 (共有三种句型)
1. 与现在的事实相反：
从句用一般过去时，主句的谓语用would (could, might) ＋动词原形
If I were Bill Gates, I would not work so hard every day.
2. 与过去的事实相反：
从句用过去完成时，主句的谓语用would (could, might) ＋ 现在完成时
If I had gone to America when I graduated from middle school, I would have got my PhD degree.
3. 与将来的事实相反：
从句用should (were to，did) + 动词原形，主句的谓语用would (could, might) ＋动词原形
If it should/were to snow tomorrow, I would go skiing.
4. 虚拟语气条件句中if的省略，此时主谓要倒装。
Had he worked harder, he would have got through the exam.
5. 条件句发生的动作和主句发生的动作不一致，(例如：条件句动作发生在过去，主句的动作发生在现在)谓语动词要根据表示的时间进行调整。
If you had taken the medicine yesterday, you would feel much better now.
If I were you, I wouldn’t have missed the film last night.
二： wish 句型 表达“但愿…，要是…多好”的语气
wish后宾语从句用虚拟语气，其谓语部分有时态变化：表示对现在情况珠