must attribute
Verbo regular: attribute - attributed- attributed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must attribute
you must attribute
he must attribute
we must attribute
you must attribute
they must attribute 	I must be attributing
you must be attributing
he must be attributing
we must be attributing
you must be attributing
they must be attributing	I must have attributed
you must have attributed
he must have attributed
we must have attributed
you must have attributed
they must have attributed	I must have been attributing
you must have been attributing
he must have been attributing
we must have been attributing
you must have been attributing
they must have been attributing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't attribute
you mustn't attribute
he mustn't attribute
we mustn't attribute
you mustn't attribute
they mustn't attribute 	I mustn't be attributing
you mustn't be attributing
he mustn't be attributing
we mustn't be attributing
you mustn't be attributing
they mustn't be attributing	I mustn't have attributed
you mustn't have attributed
he mustn't have attributed
we mustn't have attributed
you mustn't have attributed
they mustn't have attributed	I mustn't have been attributing
you mustn't have been attributing
he mustn't have been attributing
we mustn't have been attributing
you mustn't have been attributing
they mustn't have been attributing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I attribute?
must you attribute?
must he attribute?
must we attribute?
must you attribute?
must they attribute? 	must I be attributing?
must you be attributing?
must he be attributing?
must we be attributing?
must you be attributing?
must they be attributing? 	must I have attributed?
must you have attributed?
must he have attributed?
must we have attributed?
must you have attributed?
must they have attributed? 	must I have been attributing?
must you have been attributing?
must he have been attributing?
must we have been attributing?
must you have been attributing?
must they have been attributing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I attribute?
mustn't you attribute?
mustn't he attribute?
mustn't we attribute?
mustn't you attribute?
mustn't they attribute? 	mustn't I be attributing?
mustn't you be attributing?
mustn't he be attributing?
mustn't we be attributing?
mustn't you be attributing?
mustn't they be attributing? 	mustn't I have attributed?
mustn't you have attributed?
mustn't he have attributed?
mustn't we have attributed?
mustn't you have attributed?
mustn't they have attributed? 	mustn't I have been attributing?
mustn't you have been attributing?
mustn't he have been attributing?
mustn't we have been attributing?
mustn't you have been attributing?
mustn't they have been attributing?