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Indicative

Present

I know
you know
she knows
we know
they know

Present perfect

I have known
you have known
she has known
we have known
they have known

Preterit

I knew
you knew
she knew
we knew
they knew

Past perfect

I had known
you had known
she had known
we had known
they had known

Future

I will know
you will know
she will know
we will know
they will know

Future perfect

I will have known
you will have known
she will has known
we will have known
they will have known

Subjunctive

Present

I know
you know
she know
we know
they know

Present perfect

I have known
you have known
she have known
we have known
they have known

Preterit

I knew
you knew
she knew
we knew
they knew

Present perfect

I had known
you had known
she had known
we had known
they had known

Conditional

Present

I would know
you would know
she would know
we would know
they would know

Perfect

I would have known
you would have known
she would have known
we would have known
they would have known

Imperative

Present

know!
let's know!

Participle

Present participle (Gerund)

knowing

Past participle

known