must cow
Verbo regular: cow - cowed- cowed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must cow
you must cow
he must cow
we must cow
you must cow
they must cow 	I must be cowing
you must be cowing
he must be cowing
we must be cowing
you must be cowing
they must be cowing	I must have cowed
you must have cowed
he must have cowed
we must have cowed
you must have cowed
they must have cowed	I must have been cowing
you must have been cowing
he must have been cowing
we must have been cowing
you must have been cowing
they must have been cowing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not cow
you must not cow
he must not cow
we must not cow
you must not cow
they must not cow 	I must not be cowing
you must not be cowing
he must not be cowing
we must not be cowing
you must not be cowing
they must not be cowing	I must not have cowed
you must not have cowed
he must not have cowed
we must not have cowed
you must not have cowed
they must not have cowed	I must not have been cowing
you must not have been cowing
he must not have been cowing
we must not have been cowing
you must not have been cowing
they must not have been cowing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I cow?
must you cow?
must he cow?
must we cow?
must you cow?
must they cow? 	must I be cowing?
must you be cowing?
must he be cowing?
must we be cowing?
must you be cowing?
must they be cowing? 	must I have cowed?
must you have cowed?
must he have cowed?
must we have cowed?
must you have cowed?
must they have cowed? 	must I have been cowing?
must you have been cowing?
must he have been cowing?
must we have been cowing?
must you have been cowing?
must they have been cowing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not cow?
must you not cow?
must he not cow?
must we not cow?
must you not cow?
must they not cow? 	must I not be cowing?
must you not be cowing?
must he not be cowing?
must we not be cowing?
must you not be cowing?
must they not be cowing? 	must I not have cowed?
must you not have cowed?
must he not have cowed?
must we not have cowed?
must you not have cowed?
must they not have cowed? 	must I not have been cowing?
must you not have been cowing?
must he not have been cowing?
must we not have been cowing?
must you not have been cowing?
must they not have been cowing?