I can maintain you can maintain he can maintain we can maintain you can maintain they can maintain
V-ing form
I can be maintaining you can be maintaining he can be maintaining we can be maintaining you can be maintaining they can be maintaining
Perfect
I can have maintained you can have maintained he can have maintained we can have maintained you can have maintained they can have maintained
V-ing perfect
I can have been maintaining you can have been maintaining he can have been maintaining we can have been maintaining you can have been maintaining they can have been maintaining
Negation
Simple form
I cannot maintain you cannot maintain he cannot maintain we cannot maintain you cannot maintain they cannot maintain
V-ing form
I cannot be maintaining you cannot be maintaining he cannot be maintaining we cannot be maintaining you cannot be maintaining they cannot be maintaining
Perfect
I cannot have maintained you cannot have maintained he cannot have maintained we cannot have maintained you cannot have maintained they cannot have maintained
V-ing perfect
I cannot have been maintaining you cannot have been maintaining he cannot have been maintaining we cannot have been maintaining you cannot have been maintaining they cannot have been maintaining
Interrogative form
Simple form
can I maintain? can you maintain? can he maintain? can we maintain? can you maintain? can they maintain?
V-ing form
can I be maintaining? can you be maintaining? can he be maintaining? can we be maintaining? can you be maintaining? can they be maintaining?
Perfect
can I have maintained? can you have maintained? can he have maintained? can we have maintained? can you have maintained? can they have maintained?
V-ing perfect
can I have been maintaining? can you have been maintaining? can he have been maintaining? can we have been maintaining? can you have been maintaining? can they have been maintaining?
Interro-negative form
Simple form
can I not maintain? can you not maintain? can he not maintain? can we not maintain? can you not maintain? can they not maintain?
V-ing form
can I not be maintaining? can you not be maintaining? can he not be maintaining? can we not be maintaining? can you not be maintaining? can they not be maintaining?
Perfect
can I not have maintained? can you not have maintained? can he not have maintained? can we not have maintained? can you not have maintained? can they not have maintained?
V-ing perfect
can I not have been maintaining? can you not have been maintaining? can he not have been maintaining? can we not have been maintaining? can you not have been maintaining? can they not have been maintaining?