How to identification of tenses
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Explanation:
present indefinite tense = sub + do/does + not + verb-first form + object .
present continuous tense = sub + is/am/are + not + verb-ing form + object .
present perfect tense = sub + has/have + not + verb-third form + object .
present perfect continuous tense = sub + have + not + been verb-ing form + object + since/for + time.