I can chap you can chap she can chap we can chap you can chap they can chap
V-ing form
I can be chapping you can be chapping she can be chapping we can be chapping you can be chapping they can be chapping
Perfect
I can have chapped you can have chapped she can have chapped we can have chapped you can have chapped they can have chapped
V-ing perfect
I can have been chapping you can have been chapping she can have been chapping we can have been chapping you can have been chapping they can have been chapping
Negation
Simple form
I can't chap you can't chap she can't chap we can't chap you can't chap they can't chap
V-ing form
I can't be chapping you can't be chapping she can't be chapping we can't be chapping you can't be chapping they can't be chapping
Perfect
I can't have chapped you can't have chapped she can't have chapped we can't have chapped you can't have chapped they can't have chapped
V-ing perfect
I can't have been chapping you can't have been chapping she can't have been chapping we can't have been chapping you can't have been chapping they can't have been chapping
Interrogative form
Simple form
can I chap? can you chap? can she chap? can we chap? can you chap? can they chap?
V-ing form
can I be chapping? can you be chapping? can she be chapping? can we be chapping? can you be chapping? can they be chapping?
Perfect
can I have chapped? can you have chapped? can she have chapped? can we have chapped? can you have chapped? can they have chapped?
V-ing perfect
can I have been chapping? can you have been chapping? can she have been chapping? can we have been chapping? can you have been chapping? can they have been chapping?
Interro-negative form
Simple form
can't I chap? can't you chap? can't she chap? can't we chap? can't you chap? can't they chap?
V-ing form
can't I be chapping? can't you be chapping? can't she be chapping? can't we be chapping? can't you be chapping? can't they be chapping?
Perfect
can't I have chapped? can't you have chapped? can't she have chapped? can't we have chapped? can't you have chapped? can't they have chapped?
V-ing perfect
can't I have been chapping? can't you have been chapping? can't she have been chapping? can't we have been chapping? can't you have been chapping? can't they have been chapping?