would作为will的过去式为什么用于现在时那?有哪些具体用法.请列举

.(will的过去式,表示过去将来时)将
She said she would come.
她说过她会来的.
2.(表示意志)愿,要;偏要
I told her to stop nagging,but she just wouldn't listen.
我叫她别再唠叨,可她就是不听.
3.(表示过去的习惯)总是,总会
He would sit silent for hours.
他常常接连好几个小时默默地坐着.
4.(表示喜欢、意愿)愿意,要,想
I would like to have a word with you.
我想同你说句话.
5.(表示虚拟、假设、条件等)要,将要;会,就会
If I were younger,I would join you in the expedition to the Antarctic.
如果我年轻些,我就会跟你们一起去南极探险.
6.(表示婉转的请求)请
Would it be convenient for you to leave tomorrow?
明天走你方便吗?
Would you please come tonight?
你今晚来一下好吗?
7.能,能够
The hall would seat one thousand people.
这个大厅能坐一千人.