The best movie I have ever seen is Shrek. ( Up until now shrek is the best of all the movies I have seen) If you are talking about the past, you will say: The best moive I had ever seen was shrek. (At that time shrek was the best movie you had seen)
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AnonymousThe best movie I've ever seen is Shrek.I prefer the first because the tenses match better: have (I've = I have) and is are both present. (was is past.)
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The best movie I've ever seen was Shrek.