可以跟频度副词I used to golf once a week. 我过去常一个礼拜打次高尔夫也可以跟过去的时间,I used to play golf when I was young. 我年轻时候经常打高尔夫PS:注意必须是表一般过去时的时间,且是时间段,如years ago/ before I was a manager 等等表完成的如 since ……/for …… 或者表过去时间点的 last year/ yesterday/ last summer 都不可以跟used to do...