Don't be deeply confused, Ripley. You are right about using the simple past , but please take notice, though, of the meaning expressed by "I wish" + simple past.
Present tense: put the verb in the past tense:
EX: I wish I bought a bettercar than the one I have now. (i.e., I have a car)
EX: I wish I had a better car than the one I have now. (i.e., I have a car)
EX: I wish I went to London last year. (i.e., I went to London, but not last year)
Past tense: put the verb in the past perfect:
EX: I wish I had bought a car. (Note, I didn't buy a car)
Future: use "would":
EX: I wish I would buy a car.
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