1. all the time：一直。
例：I've kept on thinking about it all the time. 我一直惦记着这件事。
2. almost/nearly always：几乎总是。
3. almost never：几乎从来不。
例：He almost never missed a day. 他几乎从未误过一天工。
4. at times：有时。
例：The tide is, at times, very high. 潮水有时涨的很高。
5. constantly：不断的。
例：A wrongdoer is constantly hauted by the fear of discovery. 作恶者经常害怕被发现。
6. every now and then：时而，不时。
例：I like to smoke a big cigar every now and then. 我喜欢不时地抽一支大雪茄。
7. now and then：时而，不时。
例：Now and then we heard shorts in the woods. 我们不时听到森林里传来的枪声。
8. frequently：频繁地。
例：At one time we met frequently. 过去我们曾常常见面。
9. hardly ever：很少。
例：We hardly ever see them. 我们很少见到他们。
10. off and on：断断续续。
例：He has been working here, on and off, for two years. 他在这儿断断续续工作了两年。
11. once in a blue moon：千载难逢地。
例：Such a chance comes once in a blue moon. 这样的机会极其难得。
12. once in a while：时不时，偶尔。
例：He went to see them once in a while. 他偶尔去探望他们。
13. three times a week：一周三次。
14. twice a month：每月两次。
关键词：英语语法
