must blister
Verbo regular: blister - blistered- blistered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must blister
you must blister
he must blister
we must blister
you must blister
they must blister 	I must be blistering
you must be blistering
he must be blistering
we must be blistering
you must be blistering
they must be blistering	I must have blistered
you must have blistered
he must have blistered
we must have blistered
you must have blistered
they must have blistered	I must have been blistering
you must have been blistering
he must have been blistering
we must have been blistering
you must have been blistering
they must have been blistering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't blister
you mustn't blister
he mustn't blister
we mustn't blister
you mustn't blister
they mustn't blister 	I mustn't be blistering
you mustn't be blistering
he mustn't be blistering
we mustn't be blistering
you mustn't be blistering
they mustn't be blistering	I mustn't have blistered
you mustn't have blistered
he mustn't have blistered
we mustn't have blistered
you mustn't have blistered
they mustn't have blistered	I mustn't have been blistering
you mustn't have been blistering
he mustn't have been blistering
we mustn't have been blistering
you mustn't have been blistering
they mustn't have been blistering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I blister?
must you blister?
must he blister?
must we blister?
must you blister?
must they blister? 	must I be blistering?
must you be blistering?
must he be blistering?
must we be blistering?
must you be blistering?
must they be blistering? 	must I have blistered?
must you have blistered?
must he have blistered?
must we have blistered?
must you have blistered?
must they have blistered? 	must I have been blistering?
must you have been blistering?
must he have been blistering?
must we have been blistering?
must you have been blistering?
must they have been blistering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I blister?
mustn't you blister?
mustn't he blister?
mustn't we blister?
mustn't you blister?
mustn't they blister? 	mustn't I be blistering?
mustn't you be blistering?
mustn't he be blistering?
mustn't we be blistering?
mustn't you be blistering?
mustn't they be blistering? 	mustn't I have blistered?
mustn't you have blistered?
mustn't he have blistered?
mustn't we have blistered?
mustn't you have blistered?
mustn't they have blistered? 	mustn't I have been blistering?
mustn't you have been blistering?
mustn't he have been blistering?
mustn't we have been blistering?
mustn't you have been blistering?
mustn't they have been blistering?