English verb conjugation MUST YACK

Regular verb: yack - yacked - yacked

Affirmation

Simple form

I must yack
you must yack
she must yack
we must yack
you must yack
they must yack

V-ing form

I must be yacking
you must be yacking
she must be yacking
we must be yacking
you must be yacking
they must be yacking

Perfect

I must have yacked
you must have yacked
she must have yacked
we must have yacked
you must have yacked
they must have yacked

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I yack?
must you yack?
must she yack?
must we yack?
must you yack?
must they yack?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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