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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.
The infinitive simply names an action without reference to person, number or time. Therefore, it can't make sense without the help of a finite verb
Use the past participle (and not the past tense) with the auxiliary verb have and its parts.
Use the simple past tense (and not the present perfect) for an action complete in the past at a stated time.
When a sentence has a word or a phrase denoting past time, like yesterday, last night, last week, last year, then, ago, etc., always use a simple past tense.