1. used with the present perfect (have + has, v.3) meaning since with the beginning of time, like She has worked here since 1999. 2. Since the positive sentences mean that because similar because. - I cannot go to class because/since/for/as it is raining. 3. use since (since), to tell you the beginning of months, years, even those of other events, such as last month, two years ago,
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