could punish
Regular verb: punish - punished- punished

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could punish
you could punish
she could punish
we could punish
you could punish
they could punish 	I could be punishing
you could be punishing
she could be punishing
we could be punishing
you could be punishing
they could be punishing	I could have punished
you could have punished
she could have punished
we could have punished
you could have punished
they could have punished	I could have been punishing
you could have been punishing
she could have been punishing
we could have been punishing
you could have been punishing
they could have been punishing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't punish
you couldn't punish
she couldn't punish
we couldn't punish
you couldn't punish
they couldn't punish 	I couldn't be punishing
you couldn't be punishing
she couldn't be punishing
we couldn't be punishing
you couldn't be punishing
they couldn't be punishing	I couldn't have punished
you couldn't have punished
she couldn't have punished
we couldn't have punished
you couldn't have punished
they couldn't have punished	I couldn't have been punishing
you couldn't have been punishing
she couldn't have been punishing
we couldn't have been punishing
you couldn't have been punishing
they couldn't have been punishing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I punish?
could you punish?
could she punish?
could we punish?
could you punish?
could they punish? 	could I be punishing?
could you be punishing?
could she be punishing?
could we be punishing?
could you be punishing?
could they be punishing? 	could I have punished?
could you have punished?
could she have punished?
could we have punished?
could you have punished?
could they have punished? 	could I have been punishing?
could you have been punishing?
could she have been punishing?
could we have been punishing?
could you have been punishing?
could they have been punishing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I punish?
couldn't you punish?
couldn't she punish?
couldn't we punish?
couldn't you punish?
couldn't they punish? 	couldn't I be punishing?
couldn't you be punishing?
couldn't she be punishing?
couldn't we be punishing?
couldn't you be punishing?
couldn't they be punishing? 	couldn't I have punished?
couldn't you have punished?
couldn't she have punished?
couldn't we have punished?
couldn't you have punished?
couldn't they have punished? 	couldn't I have been punishing?
couldn't you have been punishing?
couldn't she have been punishing?
couldn't we have been punishing?
couldn't you have been punishing?
couldn't they have been punishing?