English verb conjugation
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Irregular verb: seek - sought - sought

Affirmation

Simple form	V-ing form
I must seek you must seek he must seek we must seek you must seek they must seek	I must be seeking you must be seeking he must be seeking we must be seeking you must be seeking they must be seeking
Perfect	V-ing perfect
I must have sought you must have sought he must have sought we must have sought you must have sought they must have sought	I must have been seeking you must have been seeking he must have been seeking we must have been seeking you must have been seeking they must have been seeking

Negation

Simple form	V-ing form
I mustn't seek you mustn't seek he mustn't seek we mustn't seek you mustn't seek they mustn't seek	I mustn't be seeking you mustn't be seeking he mustn't be seeking we mustn't be seeking you mustn't be seeking they mustn't be seeking
Perfect	V-ing perfect
I mustn't have sought you mustn't have sought he mustn't have sought we mustn't have sought you mustn't have sought they mustn't have sought	I mustn't have been seeking you mustn't have been seeking he mustn't have been seeking we mustn't have been seeking you mustn't have been seeking they mustn't have been seeking

Interrogative form

Simple form	V-ing form
must I seek? must you seek? must he seek? must we seek? must you seek? must they seek?	must I be seeking? must you be seeking? must he be seeking? must we be seeking? must you be seeking? must they be seeking?
Perfect	V-ing perfect
must I have sought? must you have sought? must he have sought? must we have sought? must you have sought? must they have sought?	must I have been seeking? must you have been seeking? must he have been seeking? must we have been seeking? must you have been seeking? must they have been seeking?

Interro-negative form

Simple form	V-ing form
mustn't I seek? mustn't you seek? mustn't he seek? mustn't we seek? mustn't you seek? mustn't they seek?	mustn't I be seeking? mustn't you be seeking? mustn't he be seeking? mustn't we be seeking? mustn't you be seeking? mustn't they be seeking?
Perfect	V-ing perfect
mustn't I have sought? mustn't you have sought? mustn't he have sought? mustn't we have sought? mustn't you have sought? mustn't they have sought?	mustn't I have been seeking? mustn't you have been seeking? mustn't he have been seeking? mustn't we have been seeking? mustn't you have been seeking? mustn't they have been seeking?