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 mustn't seek
you mustn't seek
she 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
she mustn't be seeking
we mustn't be seeking
you mustn't be seeking
they mustn't be seeking	I mustn't have sought
you mustn't have sought
she 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
she 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 	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 	
mustn't I seek?
mustn't you seek?
mustn't she 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 she be seeking?
mustn't we be seeking?
mustn't you be seeking?
mustn't they be seeking? 	mustn't I have sought?
mustn't you have sought?
mustn't she 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 she have been seeking?
mustn't we have been seeking?
mustn't you have been seeking?
mustn't they have been seeking?