English verb conjugation MUST SING

Irregular verb: sing - sang - sung

Affirmation

Simple form

I must sing
you must sing
he must sing
we must sing
you must sing
they must sing

V-ing form

I must be singing
you must be singing
he must be singing
we must be singing
you must be singing
they must be singing

Perfect

I must have sung
you must have sung
he must have sung
we must have sung
you must have sung
they must have sung

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I sing?
must you sing?
must he sing?
must we sing?
must you sing?
must they sing?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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