I can supplement you can supplement he can supplement we can supplement you can supplement they can supplement
V-ing form
I can be supplementing you can be supplementing he can be supplementing we can be supplementing you can be supplementing they can be supplementing
Perfect
I can have supplemented you can have supplemented he can have supplemented we can have supplemented you can have supplemented they can have supplemented
V-ing perfect
I can have been supplementing you can have been supplementing he can have been supplementing we can have been supplementing you can have been supplementing they can have been supplementing
Negation
Simple form
I can't supplement you can't supplement he can't supplement we can't supplement you can't supplement they can't supplement
V-ing form
I can't be supplementing you can't be supplementing he can't be supplementing we can't be supplementing you can't be supplementing they can't be supplementing
Perfect
I can't have supplemented you can't have supplemented he can't have supplemented we can't have supplemented you can't have supplemented they can't have supplemented
V-ing perfect
I can't have been supplementing you can't have been supplementing he can't have been supplementing we can't have been supplementing you can't have been supplementing they can't have been supplementing
Interrogative form
Simple form
can I supplement? can you supplement? can he supplement? can we supplement? can you supplement? can they supplement?
V-ing form
can I be supplementing? can you be supplementing? can he be supplementing? can we be supplementing? can you be supplementing? can they be supplementing?
Perfect
can I have supplemented? can you have supplemented? can he have supplemented? can we have supplemented? can you have supplemented? can they have supplemented?
V-ing perfect
can I have been supplementing? can you have been supplementing? can he have been supplementing? can we have been supplementing? can you have been supplementing? can they have been supplementing?
Interro-negative form
Simple form
can't I supplement? can't you supplement? can't he supplement? can't we supplement? can't you supplement? can't they supplement?
V-ing form
can't I be supplementing? can't you be supplementing? can't he be supplementing? can't we be supplementing? can't you be supplementing? can't they be supplementing?
Perfect
can't I have supplemented? can't you have supplemented? can't he have supplemented? can't we have supplemented? can't you have supplemented? can't they have supplemented?
V-ing perfect
can't I have been supplementing? can't you have been supplementing? can't he have been supplementing? can't we have been supplementing? can't you have been supplementing? can't they have been supplementing?