tenses

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Question description

i going to ask question that we have 3 tenses and each of tens has 4 branches so, according to first one tens present indefinite tens formula we have sub+verb 1st form s/es object the present tens helping verbs are do does so,why we cant use helping verb in positive sentences its my question ?  

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(Top Tutor) Daniel C.
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School: UT Austin
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