must seek
Irregular verb: seek - sought- sought

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must seek
you must seek
she must seek
we must seek
you must seek
they must seek 	I must be seeking
you must be seeking
she must be seeking
we must be seeking
you must be seeking
they must be seeking	I must have sought
you must have sought
she 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
she 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 	Perfect 	V-ing perfect 	
I must not seek
you must not seek
she must not seek
we must not seek
you must not seek
they must not seek 	I must not be seeking
you must not be seeking
she must not be seeking
we must not be seeking
you must not be seeking
they must not be seeking	I must not have sought
you must not have sought
she must not have sought
we must not have sought
you must not have sought
they must not have sought	I must not have been seeking
you must not have been seeking
she must not have been seeking
we must not have been seeking
you must not have been seeking
they must not have been seeking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I seek?
must you seek?
must she seek?
must we seek?
must you seek?
must they seek? 	must I be seeking?
must you be seeking?
must she be seeking?
must we be seeking?
must you be seeking?
must they be seeking? 	must I have sought?
must you have sought?
must she 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 she 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 	Perfect 	V-ing perfect 	
must I not seek?
must you not seek?
must she not seek?
must we not seek?
must you not seek?
must they not seek? 	must I not be seeking?
must you not be seeking?
must she not be seeking?
must we not be seeking?
must you not be seeking?
must they not be seeking? 	must I not have sought?
must you not have sought?
must she not have sought?
must we not have sought?
must you not have sought?
must they not have sought? 	must I not have been seeking?
must you not have been seeking?
must she not have been seeking?
must we not have been seeking?
must you not have been seeking?
must they not have been seeking?