English verb conjugation
COULD VULCANIZE

Regular verb: vulcanize - vulcanized - vulcanized

Affirmation

Simple form	V-ing form
I could vulcanize you could vulcanize he could vulcanize we could vulcanize you could vulcanize they could vulcanize	I could be vulcanizing you could be vulcanizing he could be vulcanizing we could be vulcanizing you could be vulcanizing they could be vulcanizing
Perfect	V-ing perfect
I could have vulcanized you could have vulcanized he could have vulcanized we could have vulcanized you could have vulcanized they could have vulcanized	I could have been vulcanizing you could have been vulcanizing he could have been vulcanizing we could have been vulcanizing you could have been vulcanizing they could have been vulcanizing

Negation

Simple form	V-ing form
I couldn't vulcanize you couldn't vulcanize he couldn't vulcanize we couldn't vulcanize you couldn't vulcanize they couldn't vulcanize	I couldn't be vulcanizing you couldn't be vulcanizing he couldn't be vulcanizing we couldn't be vulcanizing you couldn't be vulcanizing they couldn't be vulcanizing
Perfect	V-ing perfect
I couldn't have vulcanized you couldn't have vulcanized he couldn't have vulcanized we couldn't have vulcanized you couldn't have vulcanized they couldn't have vulcanized	I couldn't have been vulcanizing you couldn't have been vulcanizing he couldn't have been vulcanizing we couldn't have been vulcanizing you couldn't have been vulcanizing they couldn't have been vulcanizing

Interrogative form

Simple form	V-ing form
could I vulcanize? could you vulcanize? could he vulcanize? could we vulcanize? could you vulcanize? could they vulcanize?	could I be vulcanizing? could you be vulcanizing? could he be vulcanizing? could we be vulcanizing? could you be vulcanizing? could they be vulcanizing?
Perfect	V-ing perfect
could I have vulcanized? could you have vulcanized? could he have vulcanized? could we have vulcanized? could you have vulcanized? could they have vulcanized?	could I have been vulcanizing? could you have been vulcanizing? could he have been vulcanizing? could we have been vulcanizing? could you have been vulcanizing? could they have been vulcanizing?

Interro-negative form

Simple form	V-ing form
couldn't I vulcanize? couldn't you vulcanize? couldn't he vulcanize? couldn't we vulcanize? couldn't you vulcanize? couldn't they vulcanize?	couldn't I be vulcanizing? couldn't you be vulcanizing? couldn't he be vulcanizing? couldn't we be vulcanizing? couldn't you be vulcanizing? couldn't they be vulcanizing?
Perfect	V-ing perfect
couldn't I have vulcanized? couldn't you have vulcanized? couldn't he have vulcanized? couldn't we have vulcanized? couldn't you have vulcanized? couldn't they have vulcanized?	couldn't I have been vulcanizing? couldn't you have been vulcanizing? couldn't he have been vulcanizing? couldn't we have been vulcanizing? couldn't you have been vulcanizing? couldn't they have been vulcanizing?