I can dope you can dope he can dope we can dope you can dope they can dope
V-ing form
I can be doping you can be doping he can be doping we can be doping you can be doping they can be doping
Perfect
I can have doped you can have doped he can have doped we can have doped you can have doped they can have doped
V-ing perfect
I can have been doping you can have been doping he can have been doping we can have been doping you can have been doping they can have been doping
Negation
Simple form
I can't dope you can't dope he can't dope we can't dope you can't dope they can't dope
V-ing form
I can't be doping you can't be doping he can't be doping we can't be doping you can't be doping they can't be doping
Perfect
I can't have doped you can't have doped he can't have doped we can't have doped you can't have doped they can't have doped
V-ing perfect
I can't have been doping you can't have been doping he can't have been doping we can't have been doping you can't have been doping they can't have been doping
Interrogative form
Simple form
can I dope? can you dope? can he dope? can we dope? can you dope? can they dope?
V-ing form
can I be doping? can you be doping? can he be doping? can we be doping? can you be doping? can they be doping?
Perfect
can I have doped? can you have doped? can he have doped? can we have doped? can you have doped? can they have doped?
V-ing perfect
can I have been doping? can you have been doping? can he have been doping? can we have been doping? can you have been doping? can they have been doping?
Interro-negative form
Simple form
can't I dope? can't you dope? can't he dope? can't we dope? can't you dope? can't they dope?
V-ing form
can't I be doping? can't you be doping? can't he be doping? can't we be doping? can't you be doping? can't they be doping?
Perfect
can't I have doped? can't you have doped? can't he have doped? can't we have doped? can't you have doped? can't they have doped?
V-ing perfect
can't I have been doping? can't you have been doping? can't he have been doping? can't we have been doping? can't you have been doping? can't they have been doping?