By including "It was fantastic" in your example you show that the performance has already taken place. It's in the past. can doesn't work in that situation.
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CalifJimBy including "It was fantastic" in your example you show that the performance has already taken place. It's in the past.can doesn't work in that situation.could is acceptable, but the more accurate form is could have.How could anyone have disliked your performance? It was fantastic!(How would it have been possible — then, when you performed — that someone disliked
KnightofsportsSaid by a judge right after the performance. Which one would be better? Can or could?could.