您要查找的是不是：
- How often does that train run? 这火车多久有一班？
- How often does the train run? 这火车多久一班?
- How often do the trains run? 这些火车多久一班?
- How often does the train to Toronto run? 到多伦多的列车多长时间开一趟?
- How often have you heard managers saying, we could have won six or seven nil?And how often does that happen? 我们曾经无数次的听到教练说“我们本可以赢六、七个球”，但是，这样的大比分出现过几次？
- Come on. An 80-foot inflatable dog let loose over the city. How often does that happen? 一个80英尺高的充气狗飞在城市上空。
- How often does No. 19 run at this time of day? 现在这时候19路车每隔多久经过这里?
- How often does this bus run at this time of day? 现在这个钟点隔多长时间来一班车?
- How often does the bus to downtown run? 到市中心的公共汽车多久来一班?
- How often does this shuttle bus run? 这班车多久一趟?
- In which direction does that train go? 往哪个方向的火车?
- How often does the shuttle bus run? 专线巴士多长时间一班?
- How often does the streetcar run? 这趟电车多长时间跑一趟?
- How often do you have a bad back? 你多长时间腰痛一次?
- How often do you hear from your sister? 你多长时间接到你姐姐一次信?
- How often do the buses run on this route? 走这条路线的公车隔多久一班?
- How many times(= how often)do I have to tell you not to do that? 我得要跟你说多少回不要做那种事?
- Wow! That sounds great! How often do you go jogging? 哇！听起来真不错呀！你多久做一次慢跑啊！
- But how often do you hear about a good deed that's rewarded ? 但是您有多常听到获得回报的善行？
- How often did I pound into you that you must ask permission first? 我强调过多少次了，你一定要先征得允许。
