English verb conjugation MUST COUNTERVAIL

Regular verb: countervail - countervailed - countervailed

Affirmation

Simple form

I must countervail
you must countervail
she must countervail
we must countervail
you must countervail
they must countervail

V-ing form

I must be countervailing
you must be countervailing
she must be countervailing
we must be countervailing
you must be countervailing
they must be countervailing

Perfect

I must have countervailed
you must have countervailed
she must have countervailed
we must have countervailed
you must have countervailed
they must have countervailed

V-ing perfect

I must have been countervailing
you must have been countervailing
she must have been countervailing
we must have been countervailing
you must have been countervailing
they must have been countervailing

Negation

Simple form

I mustn't countervail
you mustn't countervail
she mustn't countervail
we mustn't countervail
you mustn't countervail
they mustn't countervail

V-ing form

I mustn't be countervailing
you mustn't be countervailing
she mustn't be countervailing
we mustn't be countervailing
you mustn't be countervailing
they mustn't be countervailing

Perfect

I mustn't have countervailed
you mustn't have countervailed
she mustn't have countervailed
we mustn't have countervailed
you mustn't have countervailed
they mustn't have countervailed

V-ing perfect

I mustn't have been countervailing
you mustn't have been countervailing
she mustn't have been countervailing
we mustn't have been countervailing
you mustn't have been countervailing
they mustn't have been countervailing

Interrogative form

Simple form

must I countervail?
must you countervail?
must she countervail?
must we countervail?
must you countervail?
must they countervail?

V-ing form

must I be countervailing?
must you be countervailing?
must she be countervailing?
must we be countervailing?
must you be countervailing?
must they be countervailing?

Perfect

must I have countervailed?
must you have countervailed?
must she have countervailed?
must we have countervailed?
must you have countervailed?
must they have countervailed?

V-ing perfect

must I have been countervailing?
must you have been countervailing?
must she have been countervailing?
must we have been countervailing?
must you have been countervailing?
must they have been countervailing?

Interro-negative form

Simple form

mustn't I countervail?
mustn't you countervail?
mustn't she countervail?
mustn't we countervail?
mustn't you countervail?
mustn't they countervail?

V-ing form

mustn't I be countervailing?
mustn't you be countervailing?
mustn't she be countervailing?
mustn't we be countervailing?
mustn't you be countervailing?
mustn't they be countervailing?

Perfect

mustn't I have countervailed?
mustn't you have countervailed?
mustn't she have countervailed?
mustn't we have countervailed?
mustn't you have countervailed?
mustn't they have countervailed?

V-ing perfect

mustn't I have been countervailing?
mustn't you have been countervailing?
mustn't she have been countervailing?
mustn't we have been countervailing?
mustn't you have been countervailing?
mustn't they have been countervailing?

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