I can comb you can comb he can comb we can comb you can comb they can comb
V-ing form
I can be combing you can be combing he can be combing we can be combing you can be combing they can be combing
Perfect
I can have combed you can have combed he can have combed we can have combed you can have combed they can have combed
V-ing perfect
I can have been combing you can have been combing he can have been combing we can have been combing you can have been combing they can have been combing
Negation
Simple form
I can't comb you can't comb he can't comb we can't comb you can't comb they can't comb
V-ing form
I can't be combing you can't be combing he can't be combing we can't be combing you can't be combing they can't be combing
Perfect
I can't have combed you can't have combed he can't have combed we can't have combed you can't have combed they can't have combed
V-ing perfect
I can't have been combing you can't have been combing he can't have been combing we can't have been combing you can't have been combing they can't have been combing
Interrogative form
Simple form
can I comb? can you comb? can he comb? can we comb? can you comb? can they comb?
V-ing form
can I be combing? can you be combing? can he be combing? can we be combing? can you be combing? can they be combing?
Perfect
can I have combed? can you have combed? can he have combed? can we have combed? can you have combed? can they have combed?
V-ing perfect
can I have been combing? can you have been combing? can he have been combing? can we have been combing? can you have been combing? can they have been combing?
Interro-negative form
Simple form
can't I comb? can't you comb? can't he comb? can't we comb? can't you comb? can't they comb?
V-ing form
can't I be combing? can't you be combing? can't he be combing? can't we be combing? can't you be combing? can't they be combing?
Perfect
can't I have combed? can't you have combed? can't he have combed? can't we have combed? can't you have combed? can't they have combed?
V-ing perfect
can't I have been combing? can't you have been combing? can't he have been combing? can't we have been combing? can't you have been combing? can't they have been combing?