They are both grammatical. " Most people want help of some sort - or have a question or a doubt or need help with a sentence. Calling this one something like "which movies" or "have you/did you" will help you find it among all the other threads with similar titles.
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AnonymousWhich one is correct and why?This is just repeating what Barbara said, but in graphical form.
AnonymousWhich movies have you watched over and over again?Where X is the present moment,