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