English verb conjugation
COULD METABOLIZE

Regular verb: metabolize - metabolized - metabolized

Affirmation

Simple form	V-ing form
I could metabolize you could metabolize he could metabolize we could metabolize you could metabolize they could metabolize	I could be metabolizing you could be metabolizing he could be metabolizing we could be metabolizing you could be metabolizing they could be metabolizing
Perfect	V-ing perfect
I could have metabolized you could have metabolized he could have metabolized we could have metabolized you could have metabolized they could have metabolized	I could have been metabolizing you could have been metabolizing he could have been metabolizing we could have been metabolizing you could have been metabolizing they could have been metabolizing

Negation

Simple form	V-ing form
I couldn't metabolize you couldn't metabolize he couldn't metabolize we couldn't metabolize you couldn't metabolize they couldn't metabolize	I couldn't be metabolizing you couldn't be metabolizing he couldn't be metabolizing we couldn't be metabolizing you couldn't be metabolizing they couldn't be metabolizing
Perfect	V-ing perfect
I couldn't have metabolized you couldn't have metabolized he couldn't have metabolized we couldn't have metabolized you couldn't have metabolized they couldn't have metabolized	I couldn't have been metabolizing you couldn't have been metabolizing he couldn't have been metabolizing we couldn't have been metabolizing you couldn't have been metabolizing they couldn't have been metabolizing

Interrogative form

Simple form	V-ing form
could I metabolize? could you metabolize? could he metabolize? could we metabolize? could you metabolize? could they metabolize?	could I be metabolizing? could you be metabolizing? could he be metabolizing? could we be metabolizing? could you be metabolizing? could they be metabolizing?
Perfect	V-ing perfect
could I have metabolized? could you have metabolized? could he have metabolized? could we have metabolized? could you have metabolized? could they have metabolized?	could I have been metabolizing? could you have been metabolizing? could he have been metabolizing? could we have been metabolizing? could you have been metabolizing? could they have been metabolizing?

Interro-negative form

Simple form	V-ing form
couldn't I metabolize? couldn't you metabolize? couldn't he metabolize? couldn't we metabolize? couldn't you metabolize? couldn't they metabolize?	couldn't I be metabolizing? couldn't you be metabolizing? couldn't he be metabolizing? couldn't we be metabolizing? couldn't you be metabolizing? couldn't they be metabolizing?
Perfect	V-ing perfect
couldn't I have metabolized? couldn't you have metabolized? couldn't he have metabolized? couldn't we have metabolized? couldn't you have metabolized? couldn't they have metabolized?	couldn't I have been metabolizing? couldn't you have been metabolizing? couldn't he have been metabolizing? couldn't we have been metabolizing? couldn't you have been metabolizing? couldn't they have been metabolizing?