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 could not hydrogenize you could not hydrogenize he could not hydrogenize we could not hydrogenize you could not hydrogenize they could not hydrogenize	I could not be hydrogenizing you could not be hydrogenizing he could not be hydrogenizing we could not be hydrogenizing you could not be hydrogenizing they could not be hydrogenizing
Perfect	V-ing perfect
I could not have hydrogenized you could not have hydrogenized he could not have hydrogenized we could not have hydrogenized you could not have hydrogenized they could not have hydrogenized	I could not have been hydrogenizing you could not have been hydrogenizing he could not have been hydrogenizing we could not have been hydrogenizing you could not have been hydrogenizing they could not 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
could I not hydrogenize? could you not hydrogenize? could he not hydrogenize? could we not hydrogenize? could you not hydrogenize? could they not hydrogenize?	could I not be hydrogenizing? could you not be hydrogenizing? could he not be hydrogenizing? could we not be hydrogenizing? could you not be hydrogenizing? could they not be hydrogenizing?
Perfect	V-ing perfect
could I not have hydrogenized? could you not have hydrogenized? could he not have hydrogenized? could we not have hydrogenized? could you not have hydrogenized? could they not have hydrogenized?	could I not have been hydrogenizing? could you not have been hydrogenizing? could he not have been hydrogenizing? could we not have been hydrogenizing? could you not have been hydrogenizing? could they not have been hydrogenizing?