English verb conjugation
COULD CATALYZE

Regular verb: catalyze - catalyzed - catalyzed

Affirmation

Simple form	V-ing form
I could catalyze you could catalyze he could catalyze we could catalyze you could catalyze they could catalyze	I could be catalyzing you could be catalyzing he could be catalyzing we could be catalyzing you could be catalyzing they could be catalyzing
Perfect	V-ing perfect
I could have catalyzed you could have catalyzed he could have catalyzed we could have catalyzed you could have catalyzed they could have catalyzed	I could have been catalyzing you could have been catalyzing he could have been catalyzing we could have been catalyzing you could have been catalyzing they could have been catalyzing

Negation

Simple form	V-ing form
I could not catalyze you could not catalyze he could not catalyze we could not catalyze you could not catalyze they could not catalyze	I could not be catalyzing you could not be catalyzing he could not be catalyzing we could not be catalyzing you could not be catalyzing they could not be catalyzing
Perfect	V-ing perfect
I could not have catalyzed you could not have catalyzed he could not have catalyzed we could not have catalyzed you could not have catalyzed they could not have catalyzed	I could not have been catalyzing you could not have been catalyzing he could not have been catalyzing we could not have been catalyzing you could not have been catalyzing they could not have been catalyzing

Interrogative form

Simple form	V-ing form
could I catalyze? could you catalyze? could he catalyze? could we catalyze? could you catalyze? could they catalyze?	could I be catalyzing? could you be catalyzing? could he be catalyzing? could we be catalyzing? could you be catalyzing? could they be catalyzing?
Perfect	V-ing perfect
could I have catalyzed? could you have catalyzed? could he have catalyzed? could we have catalyzed? could you have catalyzed? could they have catalyzed?	could I have been catalyzing? could you have been catalyzing? could he have been catalyzing? could we have been catalyzing? could you have been catalyzing? could they have been catalyzing?

Interro-negative form

Simple form	V-ing form
could I not catalyze? could you not catalyze? could he not catalyze? could we not catalyze? could you not catalyze? could they not catalyze?	could I not be catalyzing? could you not be catalyzing? could he not be catalyzing? could we not be catalyzing? could you not be catalyzing? could they not be catalyzing?
Perfect	V-ing perfect
could I not have catalyzed? could you not have catalyzed? could he not have catalyzed? could we not have catalyzed? could you not have catalyzed? could they not have catalyzed?	could I not have been catalyzing? could you not have been catalyzing? could he not have been catalyzing? could we not have been catalyzing? could you not have been catalyzing? could they not have been catalyzing?