[誤] Did you enjoy the movie? It was okay, but I would rather went to the concert.
[正] Did you enjoy the movie? It was okay, but I would rather have gone to the concert.
注:would rather do sth. 的過去時是在 would rather 后接 have + 過去分詞,表示的是對過去未做之事的向往,或對已做之事的后悔。