What is the v4 form of verb?

v4 is the "forth / ing form" of verb ( Present Participle Tense ) Example : Going, Doing, Eating, Using, Giving etc. v5 is the 'fifth form' of verb ( Simple Present Tense ) Examples : Goes, Does, Eats, Uses, Gives etc.

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Correspondingly, is it singular or plural?

Have definition: Have is a verb. It means to possess something, and it is also used as an auxiliary verb. Have is the first and second person singular present tense form of this verb, as well as the first, second, and third person present plural form. Can we use past tense after was? When you use was or been you are creating a past participle, so you need to use the past participle form of the verb. The same rule applies with the past perfect: Incorrect example: it had been knew. Correct example: it had been known.