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1. a few times 几次 2. all the time 总是 3. almost always 几乎总是 4. almost never 几乎不 5. at times 有时，偶尔 6. constantly 经常 7. every hour 每小时 8. every now and then 不时地，常常 9. every third day 每三天 10 . four times 四次 11 . frequently 经常 12. hardly ever 几乎不 13 . nearly always 几乎总是 14. now and then 偶尔，有时 15. off and on 断断续续地，时不时地 16. on the fifteenth of every month 每个月十五号 17. once in a blue moon 千载难逢，极为罕见 18. once in a while 偶尔，有时 19 . three times a week 每周三次 | 
