English verb conjugation
CAN PREPURCHASE

Regular verb: prepurchase - prepurchased - prepurchased

Affirmation

Simple form	V-ing form
I can prepurchase you can prepurchase he can prepurchase we can prepurchase you can prepurchase they can prepurchase	I can be prepurchasing you can be prepurchasing he can be prepurchasing we can be prepurchasing you can be prepurchasing they can be prepurchasing
Perfect	V-ing perfect
I can have prepurchased you can have prepurchased he can have prepurchased we can have prepurchased you can have prepurchased they can have prepurchased	I can have been prepurchasing you can have been prepurchasing he can have been prepurchasing we can have been prepurchasing you can have been prepurchasing they can have been prepurchasing

Negation

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

Interrogative form

Simple form	V-ing form
can I prepurchase? can you prepurchase? can he prepurchase? can we prepurchase? can you prepurchase? can they prepurchase?	can I be prepurchasing? can you be prepurchasing? can he be prepurchasing? can we be prepurchasing? can you be prepurchasing? can they be prepurchasing?
Perfect	V-ing perfect
can I have prepurchased? can you have prepurchased? can he have prepurchased? can we have prepurchased? can you have prepurchased? can they have prepurchased?	can I have been prepurchasing? can you have been prepurchasing? can he have been prepurchasing? can we have been prepurchasing? can you have been prepurchasing? can they have been prepurchasing?

Interro-negative form

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