English verb conjugation MUST YAK

Regular verb: yak - yaked - yaked

Affirmation

Simple form

I must yak
you must yak
he must yak
we must yak
you must yak
they must yak

V-ing form

I must be yaking
you must be yaking
he must be yaking
we must be yaking
you must be yaking
they must be yaking

Perfect

I must have yaked
you must have yaked
he must have yaked
we must have yaked
you must have yaked
they must have yaked

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I yak?
must you yak?
must he yak?
must we yak?
must you yak?
must they yak?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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