must memorize
Verbo regular: memorize - memorized- memorized

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must memorize
you must memorize
he must memorize
we must memorize
you must memorize
they must memorize 	I must be memorizing
you must be memorizing
he must be memorizing
we must be memorizing
you must be memorizing
they must be memorizing	I must have memorized
you must have memorized
he must have memorized
we must have memorized
you must have memorized
they must have memorized	I must have been memorizing
you must have been memorizing
he must have been memorizing
we must have been memorizing
you must have been memorizing
they must have been memorizing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't memorize
you mustn't memorize
he mustn't memorize
we mustn't memorize
you mustn't memorize
they mustn't memorize 	I mustn't be memorizing
you mustn't be memorizing
he mustn't be memorizing
we mustn't be memorizing
you mustn't be memorizing
they mustn't be memorizing	I mustn't have memorized
you mustn't have memorized
he mustn't have memorized
we mustn't have memorized
you mustn't have memorized
they mustn't have memorized	I mustn't have been memorizing
you mustn't have been memorizing
he mustn't have been memorizing
we mustn't have been memorizing
you mustn't have been memorizing
they mustn't have been memorizing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I memorize?
must you memorize?
must he memorize?
must we memorize?
must you memorize?
must they memorize? 	must I be memorizing?
must you be memorizing?
must he be memorizing?
must we be memorizing?
must you be memorizing?
must they be memorizing? 	must I have memorized?
must you have memorized?
must he have memorized?
must we have memorized?
must you have memorized?
must they have memorized? 	must I have been memorizing?
must you have been memorizing?
must he have been memorizing?
must we have been memorizing?
must you have been memorizing?
must they have been memorizing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I memorize?
mustn't you memorize?
mustn't he memorize?
mustn't we memorize?
mustn't you memorize?
mustn't they memorize? 	mustn't I be memorizing?
mustn't you be memorizing?
mustn't he be memorizing?
mustn't we be memorizing?
mustn't you be memorizing?
mustn't they be memorizing? 	mustn't I have memorized?
mustn't you have memorized?
mustn't he have memorized?
mustn't we have memorized?
mustn't you have memorized?
mustn't they have memorized? 	mustn't I have been memorizing?
mustn't you have been memorizing?
mustn't he have been memorizing?
mustn't we have been memorizing?
mustn't you have been memorizing?
mustn't they have been memorizing?