English verb conjugation
CAN RETESTIFY

Regular verb: retestify - retestified - retestified

Affirmation

Simple form	V-ing form
I can retestify you can retestify he can retestify we can retestify you can retestify they can retestify	I can be retestifying you can be retestifying he can be retestifying we can be retestifying you can be retestifying they can be retestifying
Perfect	V-ing perfect
I can have retestified you can have retestified he can have retestified we can have retestified you can have retestified they can have retestified	I can have been retestifying you can have been retestifying he can have been retestifying we can have been retestifying you can have been retestifying they can have been retestifying

Negation

Simple form	V-ing form
I cannot retestify you cannot retestify he cannot retestify we cannot retestify you cannot retestify they cannot retestify	I cannot be retestifying you cannot be retestifying he cannot be retestifying we cannot be retestifying you cannot be retestifying they cannot be retestifying
Perfect	V-ing perfect
I cannot have retestified you cannot have retestified he cannot have retestified we cannot have retestified you cannot have retestified they cannot have retestified	I cannot have been retestifying you cannot have been retestifying he cannot have been retestifying we cannot have been retestifying you cannot have been retestifying they cannot have been retestifying

Interrogative form

Simple form	V-ing form
can I retestify? can you retestify? can he retestify? can we retestify? can you retestify? can they retestify?	can I be retestifying? can you be retestifying? can he be retestifying? can we be retestifying? can you be retestifying? can they be retestifying?
Perfect	V-ing perfect
can I have retestified? can you have retestified? can he have retestified? can we have retestified? can you have retestified? can they have retestified?	can I have been retestifying? can you have been retestifying? can he have been retestifying? can we have been retestifying? can you have been retestifying? can they have been retestifying?

Interro-negative form

Simple form	V-ing form
can I not retestify? can you not retestify? can he not retestify? can we not retestify? can you not retestify? can they not retestify?	can I not be retestifying? can you not be retestifying? can he not be retestifying? can we not be retestifying? can you not be retestifying? can they not be retestifying?
Perfect	V-ing perfect
can I not have retestified? can you not have retestified? can he not have retestified? can we not have retestified? can you not have retestified? can they not have retestified?	can I not have been retestifying? can you not have been retestifying? can he not have been retestifying? can we not have been retestifying? can you not have been retestifying? can they not have been retestifying?