解析英语语法过去完成时 过去完成时由had+过去分词构成，因此无人称变化I had/Id worked等I had not/hadnt worked等had I worked等had I not/hadnt I worked等现在完成时：Ann has just left.If you hurry you’ll catch her.(安刚刚走。如果你快一点，就能追上她。)过去完成时：When I arrived Ann had just left.(我到的时候，安刚刚离开。)但是，过去完成时不像现在
