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As, because and since are conjunctions. As, because and since all introduce subordinate clauses. They connect the result of something with its reason. ,Exercise on »since« and »for«. - since - if the starting point is given (two o'clock, last Friday, 1998) - for - if the period of time is given (twenty minutes, two days, ... ,We often use for and since when talking about time. The structure is: FOR + period of time (example: I was sick for three days); SINCE + point in time (example: ... , Since and tenses. When since introduces an action or event at a point of time in the past, we can use the past simple or present perfect after since ...,The meaning of since - whether a conjunction , an adverb or a preposition - is determined by the structures and tenses used. Four model examples to remember:. ,six weeks. 5. He has been learning French. for, since, I don't know. eight months. ,Using Since and For. Use since + (a specific time) like March 31, or 9:19 a.m., or Tuesday. Examples: I have been studying English since 1993. John has helped ... ,since」只能用在完成式，而「for」除了用在完成式，也可以用於過去簡單式。 for + 一段時間for six years, for a week, for a month, for hours, for two hours I have worked ...
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 since and 相關參考資料
As, because or since ? - 當代英語語法 - Cambridge Dictionary
As, because and since are conjunctions. As, because and since all introduce subordinate clauses. They connect the result of something with its reason. https://dictionary.cambridge.o Exercise on 'since' and 'for' - English Vocabulary - Ego4u
Exercise on »since« and »for«. - since - if the starting point is given (two o'clock, last Friday, 1998) - for - if the period of time is given (twenty minutes, two days, ... https://www.ego4u.com FOR and SINCE for Time | Grammar | EnglishClub
We often use for and since when talking about time. The structure is: FOR + period of time (example: I was sick for three days); SINCE + point in time (example: ... https://www.englishclub.com Since - Cambridge Dictionary
Since and tenses. When since introduces an action or event at a point of time in the past, we can use the past simple or present perfect after since ... https://dictionary.cambridge.o Since and for - English grammar explained
The meaning of since - whether a conjunction , an adverb or a preposition - is determined by the structures and tenses used. Four model examples to remember:. https://linguapress.com Since and for-English - Learn English
six weeks. 5. He has been learning French. for, since, I don't know. eight months. https://www.tolearnenglish.com Using Since and For - 5 Minute English
Using Since and For. Use since + (a specific time) like March 31, or 9:19 a.m., or Tuesday. Examples: I have been studying English since 1993. John has helped ... http://www.5minuteenglish.com 在現在完成式使用「for」和「since」 | 英語文法| EF
since」只能用在完成式，而「for」除了用在完成式，也可以用於過去簡單式。 for + 一段時間for six years, for a week, for a month, for hours, for two hours I have worked ... https://www.ef.com.tw |