For period a period is a duration of time - five minutes, two weeks, six years. For means from the beginning of the period to the end of the period. Since point a point is a precise moment in time - 9 oclock, 1st january, monday.
7 synonyms and near synonyms of since from the merriam-webster thesaurus, plus 9 antonyms and near antonyms.
FOR and SINCE Quiz | Grammar | EnglishClub
This quiz tests your understanding of the correct use of for and since when describing length of time.
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When we use since, we are saying that something began in the past and is unfinished i have lived in this house since 1997.