could regroup
Regular verb: regroup - regrouped- regrouped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could regroup
you could regroup
he could regroup
we could regroup
you could regroup
they could regroup 	I could be regrouping
you could be regrouping
he could be regrouping
we could be regrouping
you could be regrouping
they could be regrouping	I could have regrouped
you could have regrouped
he could have regrouped
we could have regrouped
you could have regrouped
they could have regrouped	I could have been regrouping
you could have been regrouping
he could have been regrouping
we could have been regrouping
you could have been regrouping
they could have been regrouping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't regroup
you couldn't regroup
he couldn't regroup
we couldn't regroup
you couldn't regroup
they couldn't regroup 	I couldn't be regrouping
you couldn't be regrouping
he couldn't be regrouping
we couldn't be regrouping
you couldn't be regrouping
they couldn't be regrouping	I couldn't have regrouped
you couldn't have regrouped
he couldn't have regrouped
we couldn't have regrouped
you couldn't have regrouped
they couldn't have regrouped	I couldn't have been regrouping
you couldn't have been regrouping
he couldn't have been regrouping
we couldn't have been regrouping
you couldn't have been regrouping
they couldn't have been regrouping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I regroup?
could you regroup?
could he regroup?
could we regroup?
could you regroup?
could they regroup? 	could I be regrouping?
could you be regrouping?
could he be regrouping?
could we be regrouping?
could you be regrouping?
could they be regrouping? 	could I have regrouped?
could you have regrouped?
could he have regrouped?
could we have regrouped?
could you have regrouped?
could they have regrouped? 	could I have been regrouping?
could you have been regrouping?
could he have been regrouping?
could we have been regrouping?
could you have been regrouping?
could they have been regrouping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I regroup?
couldn't you regroup?
couldn't he regroup?
couldn't we regroup?
couldn't you regroup?
couldn't they regroup? 	couldn't I be regrouping?
couldn't you be regrouping?
couldn't he be regrouping?
couldn't we be regrouping?
couldn't you be regrouping?
couldn't they be regrouping? 	couldn't I have regrouped?
couldn't you have regrouped?
couldn't he have regrouped?
couldn't we have regrouped?
couldn't you have regrouped?
couldn't they have regrouped? 	couldn't I have been regrouping?
couldn't you have been regrouping?
couldn't he have been regrouping?
couldn't we have been regrouping?
couldn't you have been regrouping?
couldn't they have been regrouping?