[其他] 成功了. We did it. We have done it.

同样  成功了 的意思.
Dora -- We did it.
Thomas -- We have done it.

哪个用法对呢?
好像英语语法也很松,常常2个用法都可以.

还有
Your mammy is gone -- 形容词
Your mammy has gone. --- 完成式
常常2个用法都可以.

不知道说的对不对？

请老师同学指点。