I can comb you can comb she can comb we can comb you can comb they can comb
V-ing form
I can be combing you can be combing she can be combing we can be combing you can be combing they can be combing
Perfect
I can have combed you can have combed she 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 she 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 she 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 she 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 she 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 she 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 she comb? can we comb? can you comb? can they comb?
V-ing form
can I be combing? can you be combing? can she be combing? can we be combing? can you be combing? can they be combing?
Perfect
can I have combed? can you have combed? can she 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 she 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 she 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 she 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 she 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 she have been combing? can't we have been combing? can't you have been combing? can't they have been combing?