could chuff
Regular verb: chuff - chuffed- chuffed

Affirmation 	
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I could chuff
you could chuff
she could chuff
we could chuff
you could chuff
they could chuff 	I could be chuffing
you could be chuffing
she could be chuffing
we could be chuffing
you could be chuffing
they could be chuffing	I could have chuffed
you could have chuffed
she could have chuffed
we could have chuffed
you could have chuffed
they could have chuffed	I could have been chuffing
you could have been chuffing
she could have been chuffing
we could have been chuffing
you could have been chuffing
they could have been chuffing	

Negation 	
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I could not chuff
you could not chuff
she could not chuff
we could not chuff
you could not chuff
they could not chuff 	I could not be chuffing
you could not be chuffing
she could not be chuffing
we could not be chuffing
you could not be chuffing
they could not be chuffing	I could not have chuffed
you could not have chuffed
she could not have chuffed
we could not have chuffed
you could not have chuffed
they could not have chuffed	I could not have been chuffing
you could not have been chuffing
she could not have been chuffing
we could not have been chuffing
you could not have been chuffing
they could not have been chuffing	

Interrogative form 	
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could I chuff?
could you chuff?
could she chuff?
could we chuff?
could you chuff?
could they chuff? 	could I be chuffing?
could you be chuffing?
could she be chuffing?
could we be chuffing?
could you be chuffing?
could they be chuffing? 	could I have chuffed?
could you have chuffed?
could she have chuffed?
could we have chuffed?
could you have chuffed?
could they have chuffed? 	could I have been chuffing?
could you have been chuffing?
could she have been chuffing?
could we have been chuffing?
could you have been chuffing?
could they have been chuffing? 	

Interro-negative form 	
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could I not chuff?
could you not chuff?
could she not chuff?
could we not chuff?
could you not chuff?
could they not chuff? 	could I not be chuffing?
could you not be chuffing?
could she not be chuffing?
could we not be chuffing?
could you not be chuffing?
could they not be chuffing? 	could I not have chuffed?
could you not have chuffed?
could she not have chuffed?
could we not have chuffed?
could you not have chuffed?
could they not have chuffed? 	could I not have been chuffing?
could you not have been chuffing?
could she not have been chuffing?
could we not have been chuffing?
could you not have been chuffing?
could they not have been chuffing?