Since I came here/Since I've been here
I was taught that we cannot use the Present Perfect Tense after "since" :). So, it's not correct to say "since you've been gone" or "since I've been here". It's better to say: "Since I came here.." But people say like that. It means that it's correct? Or is it more common for casual speech?
There are two meanings here for since: the conjunction of time and the conjunction of cause (like because).
There is nothing wrong with your examples in my opinion.
I see no objection to them and do not consider them as only used in casual speech.
I think both are correct , Its total sub to you that which one you pick it up. some sentences are designed for formal language, some are for casual! For Further detail video animation company!
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I've never heard that Since is used with Past Simple (like "Since I came here"), contrarwise I was taught Sinse is used with Perfect Tenses (perfect and perfect continuous).. this question needs to be clarified..
I'm don't know, but I heard a similar rule in school before, but I'm sure there's nothing wrong on your examples.
Maybe the rule applies, if there is the Present Perfect on both parts of the sentence, as in before the "since" and after the "since"?