It's a pity that you can't stay longer.
你不能再多停留些时间，真是遗憾。
We went on to Paris and stayed there eleven days.
我们接着去了巴黎，在那里停留了十一天。
Like I said, you're always welcome to stay.
正如我以前所说的一样，我永远都欢迎你留下来。
I'll stay around in case you need me.
我就待在这儿，也许你用得着我。
Much as I would like to stay, I really must go home.
尽管我想留下来，但我确实必须回家。