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 couldn't devitrify you couldn't devitrify he couldn't devitrify we couldn't devitrify you couldn't devitrify they couldn't devitrify	I couldn't be devitrifying you couldn't be devitrifying he couldn't be devitrifying we couldn't be devitrifying you couldn't be devitrifying they couldn't be devitrifying
Perfect	V-ing perfect
I couldn't have devitrified you couldn't have devitrified he couldn't have devitrified we couldn't have devitrified you couldn't have devitrified they couldn't have devitrified	I couldn't have been devitrifying you couldn't have been devitrifying he couldn't have been devitrifying we couldn't have been devitrifying you couldn't have been devitrifying they couldn't 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
couldn't I devitrify? couldn't you devitrify? couldn't he devitrify? couldn't we devitrify? couldn't you devitrify? couldn't they devitrify?	couldn't I be devitrifying? couldn't you be devitrifying? couldn't he be devitrifying? couldn't we be devitrifying? couldn't you be devitrifying? couldn't they be devitrifying?
Perfect	V-ing perfect
couldn't I have devitrified? couldn't you have devitrified? couldn't he have devitrified? couldn't we have devitrified? couldn't you have devitrified? couldn't they have devitrified?	couldn't I have been devitrifying? couldn't you have been devitrifying? couldn't he have been devitrifying? couldn't we have been devitrifying? couldn't you have been devitrifying? couldn't they have been devitrifying?