must prepurchase
Regular verb: prepurchase - prepurchased- prepurchased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prepurchase
you must prepurchase
she must prepurchase
we must prepurchase
you must prepurchase
they must prepurchase 	I must be prepurchasing
you must be prepurchasing
she must be prepurchasing
we must be prepurchasing
you must be prepurchasing
they must be prepurchasing	I must have prepurchased
you must have prepurchased
she 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
she must have been prepurchasing
we must have been prepurchasing
you must have been prepurchasing
they must have been prepurchasing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not prepurchase
you must not prepurchase
she must not prepurchase
we must not prepurchase
you must not prepurchase
they must not prepurchase 	I must not be prepurchasing
you must not be prepurchasing
she must not be prepurchasing
we must not be prepurchasing
you must not be prepurchasing
they must not be prepurchasing	I must not have prepurchased
you must not have prepurchased
she must not have prepurchased
we must not have prepurchased
you must not have prepurchased
they must not have prepurchased	I must not have been prepurchasing
you must not have been prepurchasing
she must not have been prepurchasing
we must not have been prepurchasing
you must not have been prepurchasing
they must not have been prepurchasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prepurchase?
must you prepurchase?
must she prepurchase?
must we prepurchase?
must you prepurchase?
must they prepurchase? 	must I be prepurchasing?
must you be prepurchasing?
must she be prepurchasing?
must we be prepurchasing?
must you be prepurchasing?
must they be prepurchasing? 	must I have prepurchased?
must you have prepurchased?
must she 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 she have been prepurchasing?
must we have been prepurchasing?
must you have been prepurchasing?
must they have been prepurchasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not prepurchase?
must you not prepurchase?
must she not prepurchase?
must we not prepurchase?
must you not prepurchase?
must they not prepurchase? 	must I not be prepurchasing?
must you not be prepurchasing?
must she not be prepurchasing?
must we not be prepurchasing?
must you not be prepurchasing?
must they not be prepurchasing? 	must I not have prepurchased?
must you not have prepurchased?
must she not have prepurchased?
must we not have prepurchased?
must you not have prepurchased?
must they not have prepurchased? 	must I not have been prepurchasing?
must you not have been prepurchasing?
must she not have been prepurchasing?
must we not have been prepurchasing?
must you not have been prepurchasing?
must they not have been prepurchasing?