must prepurchase
Verbo regular: prepurchase - prepurchased- prepurchased

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must prepurchase
you must prepurchase
he must prepurchase
we must prepurchase
you must prepurchase
they must prepurchase 	I must be prepurchasing
you must be prepurchasing
he must be prepurchasing
we must be prepurchasing
you must be prepurchasing
they must be prepurchasing	I must have prepurchased
you must have prepurchased
he must have prepurchased
we must have prepurchased
you must have prepurchased
they must have prepurchased	I must have been prepurchasing
you must have been prepurchasing
he must have been prepurchasing
we must have been prepurchasing
you must have been prepurchasing
they must have been prepurchasing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't prepurchase
you mustn't prepurchase
he mustn't prepurchase
we mustn't prepurchase
you mustn't prepurchase
they mustn't prepurchase 	I mustn't be prepurchasing
you mustn't be prepurchasing
he mustn't be prepurchasing
we mustn't be prepurchasing
you mustn't be prepurchasing
they mustn't be prepurchasing	I mustn't have prepurchased
you mustn't have prepurchased
he mustn't have prepurchased
we mustn't have prepurchased
you mustn't have prepurchased
they mustn't have prepurchased	I mustn't have been prepurchasing
you mustn't have been prepurchasing
he mustn't have been prepurchasing
we mustn't have been prepurchasing
you mustn't have been prepurchasing
they mustn't have been prepurchasing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I prepurchase?
must you prepurchase?
must he prepurchase?
must we prepurchase?
must you prepurchase?
must they prepurchase? 	must I be prepurchasing?
must you be prepurchasing?
must he be prepurchasing?
must we be prepurchasing?
must you be prepurchasing?
must they be prepurchasing? 	must I have prepurchased?
must you have prepurchased?
must he have prepurchased?
must we have prepurchased?
must you have prepurchased?
must they have prepurchased? 	must I have been prepurchasing?
must you have been prepurchasing?
must he have been prepurchasing?
must we have been prepurchasing?
must you have been prepurchasing?
must they have been prepurchasing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I prepurchase?
mustn't you prepurchase?
mustn't he prepurchase?
mustn't we prepurchase?
mustn't you prepurchase?
mustn't they prepurchase? 	mustn't I be prepurchasing?
mustn't you be prepurchasing?
mustn't he be prepurchasing?
mustn't we be prepurchasing?
mustn't you be prepurchasing?
mustn't they be prepurchasing? 	mustn't I have prepurchased?
mustn't you have prepurchased?
mustn't he have prepurchased?
mustn't we have prepurchased?
mustn't you have prepurchased?
mustn't they have prepurchased? 	mustn't I have been prepurchasing?
mustn't you have been prepurchasing?
mustn't he have been prepurchasing?
mustn't we have been prepurchasing?
mustn't you have been prepurchasing?
mustn't they have been prepurchasing?