used to do的用法归纳（used to do的用法）
1、used to do 过去常常(表示现在不再) used to do过去常常，过去曾经;过去常常做某事He used to do his homework on Sunday, but no......
1、used to do 过去常常(表示现在不再) used to do过去常常，过去曾经;过去常常做某事He used to do his homework on Sunday, but no......
used的三种用法：used to do sth，意为过去常常做某事，现在已经不再做了；be/get used to doing sth，意为现在习惯做某事；sth be used to do ......
