频度副词：
always总是,一直；often经常；frequently经常地,usually通常地,constantly不断地；时常地;regularly.定期地；定时地,sometimes有时,occasionally偶然,偶尔,间或
,ever 曾经,rarelyadv.很少地；难得；罕有地,at times有时,偶尔； hardly几乎不,scarcely
简直没有,简直不；barely仅仅,seldomadv.很少,不常,never从不；表示次数的如once(一次),twice(两次),等等,
表示频率的相关短语：
every 引导的相关短语,如 every time,every day,every week,every month,every year 等等
all the time=the whole time一直
many times许多次,again and again一次又一次地,once more,再一次,hardly ever几乎不；几乎从来不
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