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After the auxiliary does use the infinitive without to, and not the third person of the present.
The answer to a question beginning with Does is always in the present tense, third person: Does he like the cinema? - Yes, he likes the cinema; or Yes, he does.
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.
We also use the present continuous for the future when something is pre-arranged or expected with some certainty: Lorna is arriving tomorrow at six. Tom and I are eating out tonight