English verb conjugation MUST CONCERN

Regular verb: concern - concerned - concerned

Affirmation

Simple form

I must concern
you must concern
he must concern
we must concern
you must concern
they must concern

V-ing form

I must be concerning
you must be concerning
he must be concerning
we must be concerning
you must be concerning
they must be concerning

Perfect

I must have concerned
you must have concerned
he must have concerned
we must have concerned
you must have concerned
they must have concerned

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I concern?
must you concern?
must he concern?
must we concern?
must you concern?
must they concern?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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