used to有三种结构:1、used to do some thing,2、be used to do something,3、be used to doing something或者be used to+n.(名......

请先看近年的三道中考题:1.—How does Jack usually go to school?—He ____ ride a bike,but now he ____ there to lose weight......

<正> [问][404]used to和would有时可以互换,有时不能互换,请问有无规则可循? [答]1.used to用于描述某人过去特有的状况或习惯,和......