must ken
Regular verb: ken - kened- kened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ken
you must ken
she must ken
we must ken
you must ken
they must ken 	I must be kening
you must be kening
she must be kening
we must be kening
you must be kening
they must be kening	I must have kened
you must have kened
she must have kened
we must have kened
you must have kened
they must have kened	I must have been kening
you must have been kening
she must have been kening
we must have been kening
you must have been kening
they must have been kening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't ken
you mustn't ken
she mustn't ken
we mustn't ken
you mustn't ken
they mustn't ken 	I mustn't be kening
you mustn't be kening
she mustn't be kening
we mustn't be kening
you mustn't be kening
they mustn't be kening	I mustn't have kened
you mustn't have kened
she mustn't have kened
we mustn't have kened
you mustn't have kened
they mustn't have kened	I mustn't have been kening
you mustn't have been kening
she mustn't have been kening
we mustn't have been kening
you mustn't have been kening
they mustn't have been kening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ken?
must you ken?
must she ken?
must we ken?
must you ken?
must they ken? 	must I be kening?
must you be kening?
must she be kening?
must we be kening?
must you be kening?
must they be kening? 	must I have kened?
must you have kened?
must she have kened?
must we have kened?
must you have kened?
must they have kened? 	must I have been kening?
must you have been kening?
must she have been kening?
must we have been kening?
must you have been kening?
must they have been kening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I ken?
mustn't you ken?
mustn't she ken?
mustn't we ken?
mustn't you ken?
mustn't they ken? 	mustn't I be kening?
mustn't you be kening?
mustn't she be kening?
mustn't we be kening?
mustn't you be kening?
mustn't they be kening? 	mustn't I have kened?
mustn't you have kened?
mustn't she have kened?
mustn't we have kened?
mustn't you have kened?
mustn't they have kened? 	mustn't I have been kening?
mustn't you have been kening?
mustn't she have been kening?
mustn't we have been kening?
mustn't you have been kening?
mustn't they have been kening?