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Use the past participle (and not the past tense) with the auxiliary verb have and its parts.
Use the past tense after the phrase as if or as though. He talks as if he knew everything, means He talks as he would talk if he knew everything.
Use the subjective were with the verb to be after as if: He acts as if he were a rich man.
Use the present infinitive without to, not the past tense after the auxiliary did.
the answer to a question beginning with did is always in the past tense: Did you see the picture? -Yes, I saw the picture; or Yes, I did.
Express a counterfactual (that didn't happen) condition by the past perfect and use the past conditional in the main clause. This use of the past perfect doesn't indicate a time but an impossible happening.