English verb conjugation MUST STIFLE

Regular verb: stifle - stifled - stifled

Affirmation

Simple form

I must stifle
you must stifle
he must stifle
we must stifle
you must stifle
they must stifle

V-ing form

I must be stifling
you must be stifling
he must be stifling
we must be stifling
you must be stifling
they must be stifling

Perfect

I must have stifled
you must have stifled
he must have stifled
we must have stifled
you must have stifled
they must have stifled

V-ing perfect

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

Negation

Simple form

I mustn't stifle
you mustn't stifle
he mustn't stifle
we mustn't stifle
you mustn't stifle
they mustn't stifle

V-ing form

I mustn't be stifling
you mustn't be stifling
he mustn't be stifling
we mustn't be stifling
you mustn't be stifling
they mustn't be stifling

Perfect

I mustn't have stifled
you mustn't have stifled
he mustn't have stifled
we mustn't have stifled
you mustn't have stifled
they mustn't have stifled

V-ing perfect

I mustn't have been stifling
you mustn't have been stifling
he mustn't have been stifling
we mustn't have been stifling
you mustn't have been stifling
they mustn't have been stifling

Interrogative form

Simple form

must I stifle?
must you stifle?
must he stifle?
must we stifle?
must you stifle?
must they stifle?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

mustn't I stifle?
mustn't you stifle?
mustn't he stifle?
mustn't we stifle?
mustn't you stifle?
mustn't they stifle?

V-ing form

mustn't I be stifling?
mustn't you be stifling?
mustn't he be stifling?
mustn't we be stifling?
mustn't you be stifling?
mustn't they be stifling?

Perfect

mustn't I have stifled?
mustn't you have stifled?
mustn't he have stifled?
mustn't we have stifled?
mustn't you have stifled?
mustn't they have stifled?

V-ing perfect

mustn't I have been stifling?
mustn't you have been stifling?
mustn't he have been stifling?
mustn't we have been stifling?
mustn't you have been stifling?
mustn't they have been stifling?

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