a的用法归纳

　　She's a changed woman since she got that job.

　　她自从得到了那份工作，变得判若两人。

　　A free trade agreement would be advantageous to both countries.

　　自由贸易协定对两国都会有利。

　　Respect for life is a cardinal principle of English law.

　　尊重生命是英国法律最重要的原则。

　　For a long time his death was concealed from her.

　　他的死瞒了很长时间都没告诉她。

　　We're buying a new TV with the money.

　　我们要用这笔钱买一台新电视机。