could group
Verbo regular: group - grouped- grouped

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could group
you could group
she could group
we could group
you could group
they could group 	I could be grouping
you could be grouping
she could be grouping
we could be grouping
you could be grouping
they could be grouping	I could have grouped
you could have grouped
she could have grouped
we could have grouped
you could have grouped
they could have grouped	I could have been grouping
you could have been grouping
she could have been grouping
we could have been grouping
you could have been grouping
they could have been grouping	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not group
you could not group
she could not group
we could not group
you could not group
they could not group 	I could not be grouping
you could not be grouping
she could not be grouping
we could not be grouping
you could not be grouping
they could not be grouping	I could not have grouped
you could not have grouped
she could not have grouped
we could not have grouped
you could not have grouped
they could not have grouped	I could not have been grouping
you could not have been grouping
she could not have been grouping
we could not have been grouping
you could not have been grouping
they could not have been grouping	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I group?
could you group?
could she group?
could we group?
could you group?
could they group? 	could I be grouping?
could you be grouping?
could she be grouping?
could we be grouping?
could you be grouping?
could they be grouping? 	could I have grouped?
could you have grouped?
could she have grouped?
could we have grouped?
could you have grouped?
could they have grouped? 	could I have been grouping?
could you have been grouping?
could she have been grouping?
could we have been grouping?
could you have been grouping?
could they have been grouping? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not group?
could you not group?
could she not group?
could we not group?
could you not group?
could they not group? 	could I not be grouping?
could you not be grouping?
could she not be grouping?
could we not be grouping?
could you not be grouping?
could they not be grouping? 	could I not have grouped?
could you not have grouped?
could she not have grouped?
could we not have grouped?
could you not have grouped?
could they not have grouped? 	could I not have been grouping?
could you not have been grouping?
could she not have been grouping?
could we not have been grouping?
could you not have been grouping?
could they not have been grouping?