Formulas of tense and active voice and passive voice
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present indefinite -sub+v1+s or es +ob
present continuous -sub+is/am/are+v1+ing+ob
present perfect -sub+has/have+v3+ob
present per-cont -sub+have/has+been+v1+ing+since/for+ob
present continuous -sub+is/am/are+v1+ing+ob
present perfect -sub+has/have+v3+ob
present per-cont -sub+have/has+been+v1+ing+since/for+ob
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