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Since, Until, and For
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This short lesson and quiz activity looks at the difference in usage of the since, until for. time expressions: SINCE used for the beginning of actions, UNTIL for the moment when actions end, FOR for the duration of the action. Something that is worth noting about “For” in this usage is that it generally occurs in perfect tenses: present perfect (I have done), present perfect progressive (I have been doing), past perfect progressive (I had been doing) and so on.