Hi, Let's first review the basic meaning of the two perfect tenses, via simpler examples based on the non-continuous form. Do you know the difference between these two sentences? Mary has cooked dinner.
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Anonymousdo they convey the same meaning?No.
AnonymousCan we use since and for in the past continuous tense?I have been working for this company since I was eighteen years old. Tomorrow will mark the beginning of my twentieth year with them.