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