English verb conjugation MUST STACK

Regular verb: stack - stacked - stacked


Affirmation

Simple form

I must stack
you must stack
he must stack
we must stack
you must stack
they must stack

V-ing form

I must be stacking
you must be stacking
he must be stacking
we must be stacking
you must be stacking
they must be stacking

Perfect

I must have stacked
you must have stacked
he must have stacked
we must have stacked
you must have stacked
they must have stacked

V-ing perfect

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

Negation

Simple form

I must not stack
you must not stack
he must not stack
we must not stack
you must not stack
they must not stack

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I stack?
must you stack?
must he stack?
must we stack?
must you stack?
must they stack?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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