English verb conjugation
COULD CATALYSE

Regular verb: catalyse - catalysed - catalysed

Affirmation

Simple form	V-ing form
I could catalyse you could catalyse he could catalyse we could catalyse you could catalyse they could catalyse	I could be catalysing you could be catalysing he could be catalysing we could be catalysing you could be catalysing they could be catalysing
Perfect	V-ing perfect
I could have catalysed you could have catalysed he could have catalysed we could have catalysed you could have catalysed they could have catalysed	I could have been catalysing you could have been catalysing he could have been catalysing we could have been catalysing you could have been catalysing they could have been catalysing

Negation

Simple form	V-ing form
I could not catalyse you could not catalyse he could not catalyse we could not catalyse you could not catalyse they could not catalyse	I could not be catalysing you could not be catalysing he could not be catalysing we could not be catalysing you could not be catalysing they could not be catalysing
Perfect	V-ing perfect
I could not have catalysed you could not have catalysed he could not have catalysed we could not have catalysed you could not have catalysed they could not have catalysed	I could not have been catalysing you could not have been catalysing he could not have been catalysing we could not have been catalysing you could not have been catalysing they could not have been catalysing

Interrogative form

Simple form	V-ing form
could I catalyse? could you catalyse? could he catalyse? could we catalyse? could you catalyse? could they catalyse?	could I be catalysing? could you be catalysing? could he be catalysing? could we be catalysing? could you be catalysing? could they be catalysing?
Perfect	V-ing perfect
could I have catalysed? could you have catalysed? could he have catalysed? could we have catalysed? could you have catalysed? could they have catalysed?	could I have been catalysing? could you have been catalysing? could he have been catalysing? could we have been catalysing? could you have been catalysing? could they have been catalysing?

Interro-negative form

Simple form	V-ing form
could I not catalyse? could you not catalyse? could he not catalyse? could we not catalyse? could you not catalyse? could they not catalyse?	could I not be catalysing? could you not be catalysing? could he not be catalysing? could we not be catalysing? could you not be catalysing? could they not be catalysing?
Perfect	V-ing perfect
could I not have catalysed? could you not have catalysed? could he not have catalysed? could we not have catalysed? could you not have catalysed? could they not have catalysed?	could I not have been catalysing? could you not have been catalysing? could he not have been catalysing? could we not have been catalysing? could you not have been catalysing? could they not have been catalysing?