must decease
Verbo regular: decease - deceased- deceased

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must decease
you must decease
he must decease
we must decease
you must decease
they must decease 	I must be deceasing
you must be deceasing
he must be deceasing
we must be deceasing
you must be deceasing
they must be deceasing	I must have deceased
you must have deceased
he must have deceased
we must have deceased
you must have deceased
they must have deceased	I must have been deceasing
you must have been deceasing
he must have been deceasing
we must have been deceasing
you must have been deceasing
they must have been deceasing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not decease
you must not decease
he must not decease
we must not decease
you must not decease
they must not decease 	I must not be deceasing
you must not be deceasing
he must not be deceasing
we must not be deceasing
you must not be deceasing
they must not be deceasing	I must not have deceased
you must not have deceased
he must not have deceased
we must not have deceased
you must not have deceased
they must not have deceased	I must not have been deceasing
you must not have been deceasing
he must not have been deceasing
we must not have been deceasing
you must not have been deceasing
they must not have been deceasing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I decease?
must you decease?
must he decease?
must we decease?
must you decease?
must they decease? 	must I be deceasing?
must you be deceasing?
must he be deceasing?
must we be deceasing?
must you be deceasing?
must they be deceasing? 	must I have deceased?
must you have deceased?
must he have deceased?
must we have deceased?
must you have deceased?
must they have deceased? 	must I have been deceasing?
must you have been deceasing?
must he have been deceasing?
must we have been deceasing?
must you have been deceasing?
must they have been deceasing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not decease?
must you not decease?
must he not decease?
must we not decease?
must you not decease?
must they not decease? 	must I not be deceasing?
must you not be deceasing?
must he not be deceasing?
must we not be deceasing?
must you not be deceasing?
must they not be deceasing? 	must I not have deceased?
must you not have deceased?
must he not have deceased?
must we not have deceased?
must you not have deceased?
must they not have deceased? 	must I not have been deceasing?
must you not have been deceasing?
must he not have been deceasing?
must we not have been deceasing?
must you not have been deceasing?
must they not have been deceasing?