can comb
Regular verb: comb - combed- combed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can comb
you can comb
she can comb
we can comb
you can comb
they can comb 	I can be combing
you can be combing
she can be combing
we can be combing
you can be combing
they can be combing	I can have combed
you can have combed
she can have combed
we can have combed
you can have combed
they can have combed	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 	V-ing form 	Perfect 	V-ing perfect 	
I cannot comb
you cannot comb
she cannot comb
we cannot comb
you cannot comb
they cannot comb 	I cannot be combing
you cannot be combing
she cannot be combing
we cannot be combing
you cannot be combing
they cannot be combing	I cannot have combed
you cannot have combed
she cannot have combed
we cannot have combed
you cannot have combed
they cannot have combed	I cannot have been combing
you cannot have been combing
she cannot have been combing
we cannot have been combing
you cannot have been combing
they cannot have been combing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I comb?
can you comb?
can she comb?
can we comb?
can you comb?
can they comb? 	can I be combing?
can you be combing?
can she be combing?
can we be combing?
can you be combing?
can they be combing? 	can I have combed?
can you have combed?
can she have combed?
can we have combed?
can you have combed?
can they have combed? 	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 	V-ing form 	Perfect 	V-ing perfect 	
can I not comb?
can you not comb?
can she not comb?
can we not comb?
can you not comb?
can they not comb? 	can I not be combing?
can you not be combing?
can she not be combing?
can we not be combing?
can you not be combing?
can they not be combing? 	can I not have combed?
can you not have combed?
can she not have combed?
can we not have combed?
can you not have combed?
can they not have combed? 	can I not have been combing?
can you not have been combing?
can she not have been combing?
can we not have been combing?
can you not have been combing?
can they not have been combing?