English verb conjugation
COULD VITIATE

Regular verb: vitiate - vitiated - vitiated

Affirmation

Simple form	V-ing form
I could vitiate you could vitiate he could vitiate we could vitiate you could vitiate they could vitiate	I could be vitiating you could be vitiating he could be vitiating we could be vitiating you could be vitiating they could be vitiating
Perfect	V-ing perfect
I could have vitiated you could have vitiated he could have vitiated we could have vitiated you could have vitiated they could have vitiated	I could have been vitiating you could have been vitiating he could have been vitiating we could have been vitiating you could have been vitiating they could have been vitiating

Negation

Simple form	V-ing form
I couldn't vitiate you couldn't vitiate he couldn't vitiate we couldn't vitiate you couldn't vitiate they couldn't vitiate	I couldn't be vitiating you couldn't be vitiating he couldn't be vitiating we couldn't be vitiating you couldn't be vitiating they couldn't be vitiating
Perfect	V-ing perfect
I couldn't have vitiated you couldn't have vitiated he couldn't have vitiated we couldn't have vitiated you couldn't have vitiated they couldn't have vitiated	I couldn't have been vitiating you couldn't have been vitiating he couldn't have been vitiating we couldn't have been vitiating you couldn't have been vitiating they couldn't have been vitiating

Interrogative form

Simple form	V-ing form
could I vitiate? could you vitiate? could he vitiate? could we vitiate? could you vitiate? could they vitiate?	could I be vitiating? could you be vitiating? could he be vitiating? could we be vitiating? could you be vitiating? could they be vitiating?
Perfect	V-ing perfect
could I have vitiated? could you have vitiated? could he have vitiated? could we have vitiated? could you have vitiated? could they have vitiated?	could I have been vitiating? could you have been vitiating? could he have been vitiating? could we have been vitiating? could you have been vitiating? could they have been vitiating?

Interro-negative form

Simple form	V-ing form
couldn't I vitiate? couldn't you vitiate? couldn't he vitiate? couldn't we vitiate? couldn't you vitiate? couldn't they vitiate?	couldn't I be vitiating? couldn't you be vitiating? couldn't he be vitiating? couldn't we be vitiating? couldn't you be vitiating? couldn't they be vitiating?
Perfect	V-ing perfect
couldn't I have vitiated? couldn't you have vitiated? couldn't he have vitiated? couldn't we have vitiated? couldn't you have vitiated? couldn't they have vitiated?	couldn't I have been vitiating? couldn't you have been vitiating? couldn't he have been vitiating? couldn't we have been vitiating? couldn't you have been vitiating? couldn't they have been vitiating?