【表达频率的词组】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；
