I could fantasize you could fantasize he could fantasize we could fantasize you could fantasize they could fantasize
V-ing form
I could be fantasizing you could be fantasizing he could be fantasizing we could be fantasizing you could be fantasizing they could be fantasizing
Perfect
I could have fantasized you could have fantasized he could have fantasized we could have fantasized you could have fantasized they could have fantasized
V-ing perfect
I could have been fantasizing you could have been fantasizing he could have been fantasizing we could have been fantasizing you could have been fantasizing they could have been fantasizing
Negation
Simple form
I could not fantasize you could not fantasize he could not fantasize we could not fantasize you could not fantasize they could not fantasize
V-ing form
I could not be fantasizing you could not be fantasizing he could not be fantasizing we could not be fantasizing you could not be fantasizing they could not be fantasizing
Perfect
I could not have fantasized you could not have fantasized he could not have fantasized we could not have fantasized you could not have fantasized they could not have fantasized
V-ing perfect
I could not have been fantasizing you could not have been fantasizing he could not have been fantasizing we could not have been fantasizing you could not have been fantasizing they could not have been fantasizing
Interrogative form
Simple form
could I fantasize? could you fantasize? could he fantasize? could we fantasize? could you fantasize? could they fantasize?
V-ing form
could I be fantasizing? could you be fantasizing? could he be fantasizing? could we be fantasizing? could you be fantasizing? could they be fantasizing?
Perfect
could I have fantasized? could you have fantasized? could he have fantasized? could we have fantasized? could you have fantasized? could they have fantasized?
V-ing perfect
could I have been fantasizing? could you have been fantasizing? could he have been fantasizing? could we have been fantasizing? could you have been fantasizing? could they have been fantasizing?
Interro-negative form
Simple form
could I not fantasize? could you not fantasize? could he not fantasize? could we not fantasize? could you not fantasize? could they not fantasize?
V-ing form
could I not be fantasizing? could you not be fantasizing? could he not be fantasizing? could we not be fantasizing? could you not be fantasizing? could they not be fantasizing?
Perfect
could I not have fantasized? could you not have fantasized? could he not have fantasized? could we not have fantasized? could you not have fantasized? could they not have fantasized?
V-ing perfect
could I not have been fantasizing? could you not have been fantasizing? could he not have been fantasizing? could we not have been fantasizing? could you not have been fantasizing? could they not have been fantasizing?