could regret
Regular verb: regret - regreted- regreted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could regret
you could regret
he could regret
we could regret
you could regret
they could regret 	I could be regreting
you could be regreting
he could be regreting
we could be regreting
you could be regreting
they could be regreting	I could have regreted
you could have regreted
he 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
he 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 could not regret
you could not regret
he could not regret
we could not regret
you could not regret
they could not regret 	I could not be regreting
you could not be regreting
he could not be regreting
we could not be regreting
you could not be regreting
they could not be regreting	I could not have regreted
you could not have regreted
he could not have regreted
we could not have regreted
you could not have regreted
they could not have regreted	I could not have been regreting
you could not have been regreting
he could not have been regreting
we could not have been regreting
you could not have been regreting
they could not have been regreting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I regret?
could you regret?
could he regret?
could we regret?
could you regret?
could they regret? 	could I be regreting?
could you be regreting?
could he be regreting?
could we be regreting?
could you be regreting?
could they be regreting? 	could I have regreted?
could you have regreted?
could he 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 he 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 	
could I not regret?
could you not regret?
could he not regret?
could we not regret?
could you not regret?
could they not regret? 	could I not be regreting?
could you not be regreting?
could he not be regreting?
could we not be regreting?
could you not be regreting?
could they not be regreting? 	could I not have regreted?
could you not have regreted?
could he not have regreted?
could we not have regreted?
could you not have regreted?
could they not have regreted? 	could I not have been regreting?
could you not have been regreting?
could he not have been regreting?
could we not have been regreting?
could you not have been regreting?
could they not have been regreting?