could regret
Regular verb: regret - regreted- regreted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could regret
you could regret
she could regret
we could regret
you could regret
they could regret 	I could be regreting
you could be regreting
she could be regreting
we could be regreting
you could be regreting
they could be regreting	I could have regreted
you could have regreted
she could have regreted
we could have regreted
you could have regreted
they could have regreted	I could have been regreting
you could have been regreting
she could have been regreting
we could have been regreting
you could have been regreting
they could have been regreting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't regret
you couldn't regret
she couldn't regret
we couldn't regret
you couldn't regret
they couldn't regret 	I couldn't be regreting
you couldn't be regreting
she couldn't be regreting
we couldn't be regreting
you couldn't be regreting
they couldn't be regreting	I couldn't have regreted
you couldn't have regreted
she couldn't have regreted
we couldn't have regreted
you couldn't have regreted
they couldn't have regreted	I couldn't have been regreting
you couldn't have been regreting
she couldn't have been regreting
we couldn't have been regreting
you couldn't have been regreting
they couldn't have been regreting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I regret?
could you regret?
could she regret?
could we regret?
could you regret?
could they regret? 	could I be regreting?
could you be regreting?
could she be regreting?
could we be regreting?
could you be regreting?
could they be regreting? 	could I have regreted?
could you have regreted?
could she have regreted?
could we have regreted?
could you have regreted?
could they have regreted? 	could I have been regreting?
could you have been regreting?
could she have been regreting?
could we have been regreting?
could you have been regreting?
could they have been regreting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I regret?
couldn't you regret?
couldn't she regret?
couldn't we regret?
couldn't you regret?
couldn't they regret? 	couldn't I be regreting?
couldn't you be regreting?
couldn't she be regreting?
couldn't we be regreting?
couldn't you be regreting?
couldn't they be regreting? 	couldn't I have regreted?
couldn't you have regreted?
couldn't she have regreted?
couldn't we have regreted?
couldn't you have regreted?
couldn't they have regreted? 	couldn't I have been regreting?
couldn't you have been regreting?
couldn't she have been regreting?
couldn't we have been regreting?
couldn't you have been regreting?
couldn't they have been regreting?