I could verbalize you could verbalize he could verbalize we could verbalize you could verbalize they could verbalize
V-ing form
I could be verbalizing you could be verbalizing he could be verbalizing we could be verbalizing you could be verbalizing they could be verbalizing
Perfect
I could have verbalized you could have verbalized he could have verbalized we could have verbalized you could have verbalized they could have verbalized
V-ing perfect
I could have been verbalizing you could have been verbalizing he could have been verbalizing we could have been verbalizing you could have been verbalizing they could have been verbalizing
Negation
Simple form
I could not verbalize you could not verbalize he could not verbalize we could not verbalize you could not verbalize they could not verbalize
V-ing form
I could not be verbalizing you could not be verbalizing he could not be verbalizing we could not be verbalizing you could not be verbalizing they could not be verbalizing
Perfect
I could not have verbalized you could not have verbalized he could not have verbalized we could not have verbalized you could not have verbalized they could not have verbalized
V-ing perfect
I could not have been verbalizing you could not have been verbalizing he could not have been verbalizing we could not have been verbalizing you could not have been verbalizing they could not have been verbalizing
Interrogative form
Simple form
could I verbalize? could you verbalize? could he verbalize? could we verbalize? could you verbalize? could they verbalize?
V-ing form
could I be verbalizing? could you be verbalizing? could he be verbalizing? could we be verbalizing? could you be verbalizing? could they be verbalizing?
Perfect
could I have verbalized? could you have verbalized? could he have verbalized? could we have verbalized? could you have verbalized? could they have verbalized?
V-ing perfect
could I have been verbalizing? could you have been verbalizing? could he have been verbalizing? could we have been verbalizing? could you have been verbalizing? could they have been verbalizing?
Interro-negative form
Simple form
could I not verbalize? could you not verbalize? could he not verbalize? could we not verbalize? could you not verbalize? could they not verbalize?
V-ing form
could I not be verbalizing? could you not be verbalizing? could he not be verbalizing? could we not be verbalizing? could you not be verbalizing? could they not be verbalizing?
Perfect
could I not have verbalized? could you not have verbalized? could he not have verbalized? could we not have verbalized? could you not have verbalized? could they not have verbalized?
V-ing perfect
could I not have been verbalizing? could you not have been verbalizing? could he not have been verbalizing? could we not have been verbalizing? could you not have been verbalizing? could they not have been verbalizing?