"The new cap is good news." "Either we will be able to use it to stop the flow, or we will be able to use it to capture almost all of the oil until the relief well is done.

VOA: standard.2010.07.16

Were it not better done as others use, To sport with Amaryllis in the shade, ? Or with the tangles of Neaera's hair?

为何不像他人一样，在树荫下玩弄喇叭花，或是尼哀若的发卷？

耶鲁公开课 - 弥尔顿课程节选

Use this pattern in any situation where you want to explain you've done it before.

当你想解释之前已经做过某事的时候，可以在各种情形下使用这个句型。

I've already 课堂 - SpeakingMax英语口语达人