English verb conjugation
COULD DEVITRIFY

Regular verb: devitrify - devitrified - devitrified

Affirmation

Simple form	V-ing form
I could devitrify you could devitrify he could devitrify we could devitrify you could devitrify they could devitrify	I could be devitrifying you could be devitrifying he could be devitrifying we could be devitrifying you could be devitrifying they could be devitrifying
Perfect	V-ing perfect
I could have devitrified you could have devitrified he could have devitrified we could have devitrified you could have devitrified they could have devitrified	I could have been devitrifying you could have been devitrifying he could have been devitrifying we could have been devitrifying you could have been devitrifying they could have been devitrifying

Negation

Simple form	V-ing form
I could not devitrify you could not devitrify he could not devitrify we could not devitrify you could not devitrify they could not devitrify	I could not be devitrifying you could not be devitrifying he could not be devitrifying we could not be devitrifying you could not be devitrifying they could not be devitrifying
Perfect	V-ing perfect
I could not have devitrified you could not have devitrified he could not have devitrified we could not have devitrified you could not have devitrified they could not have devitrified	I could not have been devitrifying you could not have been devitrifying he could not have been devitrifying we could not have been devitrifying you could not have been devitrifying they could not have been devitrifying

Interrogative form

Simple form	V-ing form
could I devitrify? could you devitrify? could he devitrify? could we devitrify? could you devitrify? could they devitrify?	could I be devitrifying? could you be devitrifying? could he be devitrifying? could we be devitrifying? could you be devitrifying? could they be devitrifying?
Perfect	V-ing perfect
could I have devitrified? could you have devitrified? could he have devitrified? could we have devitrified? could you have devitrified? could they have devitrified?	could I have been devitrifying? could you have been devitrifying? could he have been devitrifying? could we have been devitrifying? could you have been devitrifying? could they have been devitrifying?

Interro-negative form

Simple form	V-ing form
could I not devitrify? could you not devitrify? could he not devitrify? could we not devitrify? could you not devitrify? could they not devitrify?	could I not be devitrifying? could you not be devitrifying? could he not be devitrifying? could we not be devitrifying? could you not be devitrifying? could they not be devitrifying?
Perfect	V-ing perfect
could I not have devitrified? could you not have devitrified? could he not have devitrified? could we not have devitrified? could you not have devitrified? could they not have devitrified?	could I not have been devitrifying? could you not have been devitrifying? could he not have been devitrifying? could we not have been devitrifying? could you not have been devitrifying? could they not have been devitrifying?