English verb conjugation MUST YAWN

Regular verb: yawn - yawned - yawned

Affirmation

Simple form

I must yawn
you must yawn
he must yawn
we must yawn
you must yawn
they must yawn

V-ing form

I must be yawning
you must be yawning
he must be yawning
we must be yawning
you must be yawning
they must be yawning

Perfect

I must have yawned
you must have yawned
he 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
he must have been yawning
we must have been yawning
you must have been yawning
they must have been yawning

Negation

Simple form

I must not yawn
you must not yawn
he must not yawn
we must not yawn
you must not yawn
they must not yawn

V-ing form

I must not be yawning
you must not be yawning
he must not be yawning
we must not be yawning
you must not be yawning
they must not be yawning

Perfect

I must not have yawned
you must not have yawned
he must not have yawned
we must not have yawned
you must not have yawned
they must not have yawned

V-ing perfect

I must not have been yawning
you must not have been yawning
he must not have been yawning
we must not have been yawning
you must not have been yawning
they must not have been yawning

Interrogative form

Simple form

must I yawn?
must you yawn?
must he yawn?
must we yawn?
must you yawn?
must they yawn?

V-ing form

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

Perfect

must I have yawned?
must you have yawned?
must he 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 he have been yawning?
must we have been yawning?
must you have been yawning?
must they have been yawning?

Interro-negative form

Simple form

must I not yawn?
must you not yawn?
must he not yawn?
must we not yawn?
must you not yawn?
must they not yawn?

V-ing form

must I not be yawning?
must you not be yawning?
must he not be yawning?
must we not be yawning?
must you not be yawning?
must they not be yawning?

Perfect

must I not have yawned?
must you not have yawned?
must he not have yawned?
must we not have yawned?
must you not have yawned?
must they not have yawned?

V-ing perfect

must I not have been yawning?
must you not have been yawning?
must he not have been yawning?
must we not have been yawning?
must you not have been yawning?
must they not have been yawning?

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