1. left(过去分词或者形容词，剩余、剩下、留下之类的意思，不是左之类的意思）能否为前置定语？

2. 以下几句中，left是什么成分？过去分词还是形容词？怎么理解？

If there is a certain amount of something left, or if you have a certain amount of it left, it remains when the rest has gone or been used.

Is there any coffee left?（能否说we have left some coffee.)

How many tickets do you have left?（能否回答为we have left 2 tickets.）

The only course of action left to me was to notify her employer.