English verb conjugation
COULD VOCALIZE

Regular verb: vocalize - vocalized - vocalized

Affirmation

Simple form	V-ing form
I could vocalize you could vocalize she could vocalize we could vocalize you could vocalize they could vocalize	I could be vocalizing you could be vocalizing she could be vocalizing we could be vocalizing you could be vocalizing they could be vocalizing
Perfect	V-ing perfect
I could have vocalized you could have vocalized she could have vocalized we could have vocalized you could have vocalized they could have vocalized	I could have been vocalizing you could have been vocalizing she could have been vocalizing we could have been vocalizing you could have been vocalizing they could have been vocalizing

Negation

Simple form	V-ing form
I could not vocalize you could not vocalize she could not vocalize we could not vocalize you could not vocalize they could not vocalize	I could not be vocalizing you could not be vocalizing she could not be vocalizing we could not be vocalizing you could not be vocalizing they could not be vocalizing
Perfect	V-ing perfect
I could not have vocalized you could not have vocalized she could not have vocalized we could not have vocalized you could not have vocalized they could not have vocalized	I could not have been vocalizing you could not have been vocalizing she could not have been vocalizing we could not have been vocalizing you could not have been vocalizing they could not have been vocalizing

Interrogative form

Simple form	V-ing form
could I vocalize? could you vocalize? could she vocalize? could we vocalize? could you vocalize? could they vocalize?	could I be vocalizing? could you be vocalizing? could she be vocalizing? could we be vocalizing? could you be vocalizing? could they be vocalizing?
Perfect	V-ing perfect
could I have vocalized? could you have vocalized? could she have vocalized? could we have vocalized? could you have vocalized? could they have vocalized?	could I have been vocalizing? could you have been vocalizing? could she have been vocalizing? could we have been vocalizing? could you have been vocalizing? could they have been vocalizing?

Interro-negative form

Simple form	V-ing form
could I not vocalize? could you not vocalize? could she not vocalize? could we not vocalize? could you not vocalize? could they not vocalize?	could I not be vocalizing? could you not be vocalizing? could she not be vocalizing? could we not be vocalizing? could you not be vocalizing? could they not be vocalizing?
Perfect	V-ing perfect
could I not have vocalized? could you not have vocalized? could she not have vocalized? could we not have vocalized? could you not have vocalized? could they not have vocalized?	could I not have been vocalizing? could you not have been vocalizing? could she not have been vocalizing? could we not have been vocalizing? could you not have been vocalizing? could they not have been vocalizing?