English verb conjugation
MUST PREPURCHASE

Regular verb: prepurchase - prepurchased - prepurchased

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I must not prepurchase you must not prepurchase he 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 he must not be prepurchasing we must not be prepurchasing you must not be prepurchasing they must not be prepurchasing
Perfect	V-ing perfect
I must not have prepurchased you must not have prepurchased he 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 he 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
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?
Perfect	V-ing perfect
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?

Interro-negative form

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