#1 is ungrammatical. #2 is somewhat unnatural. "
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NewguestBecause of the word "yesterday" I am more inclined to use the past simple tense.
NewguestIs the word "since" the only reason why you used the perfect tense?It's not the word "since"; it's the context that calls for the use of the present perfect and for the word "since", for that matter!
CalifJim NewguestBecause of the word "yesterday" I am more inclined to use the past simple tense. But neither of your examples contains the past simple tense.Yeah, I've just noticed that.