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Indicative

Present

I understand
you understand
she understands
we understand
they understand

Present perfect

I have understood
you have understood
she has understood
we have understood
they have understood

Preterit

I understood
you understood
she understood
we understood
they understood

Past perfect

I had understood
you had understood
she had understood
we had understood
they had understood

Future

I will understand
you will understand
she will understand
we will understand
they will understand

Future perfect

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

Subjunctive

Present

I understand
you understand
she understand
we understand
they understand

Present perfect

I have understood
you have understood
she have understood
we have understood
they have understood

Preterit

I understood
you understood
she understood
we understood
they understood

Present perfect

I had understood
you had understood
she had understood
we had understood
they had understood

Conditional

Present

I would understand
you would understand
she would understand
we would understand
they would understand

Perfect

I would have understood
you would have understood
she would have understood
we would have understood
they would have understood

Imperative

Present

understand!
let's understand!

Participle

Present participle (Gerund)

understanding

Past participle

understood