曾经做过英语

used to do sth 不是过去曾经做过某事,而是过去常常做某事.比如 I used to go to the coffee shop next door.我过去常常在家门口的咖啡店喝咖啡.曾经做过某事可以直接用过去式,再用上once也可以比如 I went to Beiji...

used to do sth 不是过去曾经做过某事，而是过去常常做某事。比如 I used to go to the coffee shop next door.我过去常常在家门口的咖啡店喝咖啡。曾经做过某事可以直接用过去式，再用上once也可以比如 I went to Beijing once to see the Olympics. 我曾经去过北京看奥运会。Once 的位置比较灵活，可以在句首、句中和句尾。

I have do sth befor.

应该是 get used to doing sth = 习惯于做某事或者是 used to do sth 过去曾经作过某事 He got used to eating peppers.他习惯吃辣椒了。 He used

I once did it.

have ever done something