English verb conjugation MUST IMPAIR

Regular verb: impair - impaired - impaired

Affirmation

Simple form

I must impair
you must impair
he must impair
we must impair
you must impair
they must impair

V-ing form

I must be impairing
you must be impairing
he must be impairing
we must be impairing
you must be impairing
they must be impairing

Perfect

I must have impaired
you must have impaired
he must have impaired
we must have impaired
you must have impaired
they must have impaired

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I impair?
must you impair?
must he impair?
must we impair?
must you impair?
must they impair?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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