English verb conjugation MUST UNDO

Irregular verb: undo - undid - undone

Affirmation

Simple form

I must undo
you must undo
he must undo
we must undo
you must undo
they must undo

V-ing form

I must be undoing
you must be undoing
he must be undoing
we must be undoing
you must be undoing
they must be undoing

Perfect

I must have undone
you must have undone
he must have undone
we must have undone
you must have undone
they must have undone

V-ing perfect

I must have been undoing
you must have been undoing
he must have been undoing
we must have been undoing
you must have been undoing
they must have been undoing

Negation

Simple form

I must not undo
you must not undo
he must not undo
we must not undo
you must not undo
they must not undo

V-ing form

I must not be undoing
you must not be undoing
he must not be undoing
we must not be undoing
you must not be undoing
they must not be undoing

Perfect

I must not have undone
you must not have undone
he must not have undone
we must not have undone
you must not have undone
they must not have undone

V-ing perfect

I must not have been undoing
you must not have been undoing
he must not have been undoing
we must not have been undoing
you must not have been undoing
they must not have been undoing

Interrogative form

Simple form

must I undo?
must you undo?
must he undo?
must we undo?
must you undo?
must they undo?

V-ing form

must I be undoing?
must you be undoing?
must he be undoing?
must we be undoing?
must you be undoing?
must they be undoing?

Perfect

must I have undone?
must you have undone?
must he have undone?
must we have undone?
must you have undone?
must they have undone?

V-ing perfect

must I have been undoing?
must you have been undoing?
must he have been undoing?
must we have been undoing?
must you have been undoing?
must they have been undoing?

Interro-negative form

Simple form

must I not undo?
must you not undo?
must he not undo?
must we not undo?
must you not undo?
must they not undo?

V-ing form

must I not be undoing?
must you not be undoing?
must he not be undoing?
must we not be undoing?
must you not be undoing?
must they not be undoing?

Perfect

must I not have undone?
must you not have undone?
must he not have undone?
must we not have undone?
must you not have undone?
must they not have undone?

V-ing perfect

must I not have been undoing?
must you not have been undoing?
must he not have been undoing?
must we not have been undoing?
must you not have been undoing?
must they not have been undoing?

Page top