English verb conjugation MUST YAWN

Regular verb: yawn - yawned - yawned

Affirmation

Simple form

I must yawn
you must yawn
she must yawn
we must yawn
you must yawn
they must yawn

V-ing form

I must be yawning
you must be yawning
she must be yawning
we must be yawning
you must be yawning
they must be yawning

Perfect

I must have yawned
you must have yawned
she must have yawned
we must have yawned
you must have yawned
they must have yawned

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I yawn?
must you yawn?
must she yawn?
must we yawn?
must you yawn?
must they yawn?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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