English verb conjugation
COULD HYDROGENIZE

Regular verb: hydrogenize - hydrogenized - hydrogenized

Affirmation

Simple form	V-ing form
I could hydrogenize you could hydrogenize he could hydrogenize we could hydrogenize you could hydrogenize they could hydrogenize	I could be hydrogenizing you could be hydrogenizing he could be hydrogenizing we could be hydrogenizing you could be hydrogenizing they could be hydrogenizing
Perfect	V-ing perfect
I could have hydrogenized you could have hydrogenized he could have hydrogenized we could have hydrogenized you could have hydrogenized they could have hydrogenized	I could have been hydrogenizing you could have been hydrogenizing he could have been hydrogenizing we could have been hydrogenizing you could have been hydrogenizing they could have been hydrogenizing

Negation

Simple form	V-ing form
I couldn't hydrogenize you couldn't hydrogenize he couldn't hydrogenize we couldn't hydrogenize you couldn't hydrogenize they couldn't hydrogenize	I couldn't be hydrogenizing you couldn't be hydrogenizing he couldn't be hydrogenizing we couldn't be hydrogenizing you couldn't be hydrogenizing they couldn't be hydrogenizing
Perfect	V-ing perfect
I couldn't have hydrogenized you couldn't have hydrogenized he couldn't have hydrogenized we couldn't have hydrogenized you couldn't have hydrogenized they couldn't have hydrogenized	I couldn't have been hydrogenizing you couldn't have been hydrogenizing he couldn't have been hydrogenizing we couldn't have been hydrogenizing you couldn't have been hydrogenizing they couldn't have been hydrogenizing

Interrogative form

Simple form	V-ing form
could I hydrogenize? could you hydrogenize? could he hydrogenize? could we hydrogenize? could you hydrogenize? could they hydrogenize?	could I be hydrogenizing? could you be hydrogenizing? could he be hydrogenizing? could we be hydrogenizing? could you be hydrogenizing? could they be hydrogenizing?
Perfect	V-ing perfect
could I have hydrogenized? could you have hydrogenized? could he have hydrogenized? could we have hydrogenized? could you have hydrogenized? could they have hydrogenized?	could I have been hydrogenizing? could you have been hydrogenizing? could he have been hydrogenizing? could we have been hydrogenizing? could you have been hydrogenizing? could they have been hydrogenizing?

Interro-negative form

Simple form	V-ing form
couldn't I hydrogenize? couldn't you hydrogenize? couldn't he hydrogenize? couldn't we hydrogenize? couldn't you hydrogenize? couldn't they hydrogenize?	couldn't I be hydrogenizing? couldn't you be hydrogenizing? couldn't he be hydrogenizing? couldn't we be hydrogenizing? couldn't you be hydrogenizing? couldn't they be hydrogenizing?
Perfect	V-ing perfect
couldn't I have hydrogenized? couldn't you have hydrogenized? couldn't he have hydrogenized? couldn't we have hydrogenized? couldn't you have hydrogenized? couldn't they have hydrogenized?	couldn't I have been hydrogenizing? couldn't you have been hydrogenizing? couldn't he have been hydrogenizing? couldn't we have been hydrogenizing? couldn't you have been hydrogenizing? couldn't they have been hydrogenizing?