used to do的用法总结 used to do,过去常常做某事,意思是现在不做了,主语常是人,当然也可以是能实施动作的动物等。 扩展资料 The soldiers all used to do a six-month tour of duty in Northern Ireland. 士兵过去都要在北爱尔兰服役六个月。 I used to do that when you were a little girl, remember? 在你还是小女孩的时候我曾经那么做过，记得吗？ Potential energy can be used to do work. 势能可以用来做功。 The lecturer used to do well, but he seems to have gone off now. 这个讲师以前挺好，但如今似乎讲得差了。 I used to do it all the time. 我以前都是这样的。 本文来源：https://www.wddqw.com/doc/a81e7741a46e58fafab069dc5022aaea988f4114.html