一般过去时的特殊用法
a)在虚拟语气中表示现在或将来时间的动作或状态。
　　It's time we went.
　　该是我们走的时候了。
　　I wish I were twenty years younger.
　　但愿我年轻20岁。
　　I would rather you didn't do anything for the time being.
　　我宁愿你暂时先不要采取什么措施。
b)在口语中，一般过去时往往显示委婉客气。
　　I wondered if you could give me a hand.
　　我想请你帮个忙。
　　Might I come and see you tonight?
　　我想今晚来看你，好吗？