two years ago是什么时态的标志词

例句;

I used to smoke but I gave up two years ago.

我过去抽烟，但两年前就戒了。

Martha graduated from high school two years ago.

玛莎两年前高中毕业。

The cost is about half as much again as it was two years ago.

现在的价格比两年前提高约一半。

We were divorced two years ago and she has since remarried.

我们两年前离了婚，之后她又再婚了。

Come on, Sue, that was two years ago.

得了吧，休，那是两年前。