The tense is carried by the auxiliary verb do -- not by the main verb. Only the first of the three groups below can leave out the auxiliary and use the inflected forms of the main verb instead (like goes and went in the case of the verb go ). I do go; you do go; he does go; ...
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why do we need to change theOnly one past marker is allowed within a single clause. The auxiliary takes the past marker, so the main verb cannot. The regular past marker ispastverb to a bareinfinityinfinitive in question and negative form