must keen
Verbo regular: keen - keened- keened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must keen
you must keen
she must keen
we must keen
you must keen
they must keen 	I must be keening
you must be keening
she must be keening
we must be keening
you must be keening
they must be keening	I must have keened
you must have keened
she must have keened
we must have keened
you must have keened
they must have keened	I must have been keening
you must have been keening
she must have been keening
we must have been keening
you must have been keening
they must have been keening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not keen
you must not keen
she must not keen
we must not keen
you must not keen
they must not keen 	I must not be keening
you must not be keening
she must not be keening
we must not be keening
you must not be keening
they must not be keening	I must not have keened
you must not have keened
she must not have keened
we must not have keened
you must not have keened
they must not have keened	I must not have been keening
you must not have been keening
she must not have been keening
we must not have been keening
you must not have been keening
they must not have been keening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I keen?
must you keen?
must she keen?
must we keen?
must you keen?
must they keen? 	must I be keening?
must you be keening?
must she be keening?
must we be keening?
must you be keening?
must they be keening? 	must I have keened?
must you have keened?
must she have keened?
must we have keened?
must you have keened?
must they have keened? 	must I have been keening?
must you have been keening?
must she have been keening?
must we have been keening?
must you have been keening?
must they have been keening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not keen?
must you not keen?
must she not keen?
must we not keen?
must you not keen?
must they not keen? 	must I not be keening?
must you not be keening?
must she not be keening?
must we not be keening?
must you not be keening?
must they not be keening? 	must I not have keened?
must you not have keened?
must she not have keened?
must we not have keened?
must you not have keened?
must they not have keened? 	must I not have been keening?
must you not have been keening?
must she not have been keening?
must we not have been keening?
must you not have been keening?
must they not have been keening?