must canker
Verbo regular: canker - cankered- cankered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must canker
you must canker
he must canker
we must canker
you must canker
they must canker 	I must be cankering
you must be cankering
he must be cankering
we must be cankering
you must be cankering
they must be cankering	I must have cankered
you must have cankered
he must have cankered
we must have cankered
you must have cankered
they must have cankered	I must have been cankering
you must have been cankering
he must have been cankering
we must have been cankering
you must have been cankering
they must have been cankering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not canker
you must not canker
he must not canker
we must not canker
you must not canker
they must not canker 	I must not be cankering
you must not be cankering
he must not be cankering
we must not be cankering
you must not be cankering
they must not be cankering	I must not have cankered
you must not have cankered
he must not have cankered
we must not have cankered
you must not have cankered
they must not have cankered	I must not have been cankering
you must not have been cankering
he must not have been cankering
we must not have been cankering
you must not have been cankering
they must not have been cankering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I canker?
must you canker?
must he canker?
must we canker?
must you canker?
must they canker? 	must I be cankering?
must you be cankering?
must he be cankering?
must we be cankering?
must you be cankering?
must they be cankering? 	must I have cankered?
must you have cankered?
must he have cankered?
must we have cankered?
must you have cankered?
must they have cankered? 	must I have been cankering?
must you have been cankering?
must he have been cankering?
must we have been cankering?
must you have been cankering?
must they have been cankering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not canker?
must you not canker?
must he not canker?
must we not canker?
must you not canker?
must they not canker? 	must I not be cankering?
must you not be cankering?
must he not be cankering?
must we not be cankering?
must you not be cankering?
must they not be cankering? 	must I not have cankered?
must you not have cankered?
must he not have cankered?
must we not have cankered?
must you not have cankered?
must they not have cankered? 	must I not have been cankering?
must you not have been cankering?
must he not have been cankering?
must we not have been cankering?
must you not have been cankering?
must they not have been cankering?