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 couldn't group
you couldn't group
she couldn't group
we couldn't group
you couldn't group
they couldn't group 	I couldn't be grouping
you couldn't be grouping
she couldn't be grouping
we couldn't be grouping
you couldn't be grouping
they couldn't be grouping	I couldn't have grouped
you couldn't have grouped
she couldn't have grouped
we couldn't have grouped
you couldn't have grouped
they couldn't have grouped	I couldn't have been grouping
you couldn't have been grouping
she couldn't have been grouping
we couldn't have been grouping
you couldn't have been grouping
they couldn't 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 	
couldn't I group?
couldn't you group?
couldn't she group?
couldn't we group?
couldn't you group?
couldn't they group? 	couldn't I be grouping?
couldn't you be grouping?
couldn't she be grouping?
couldn't we be grouping?
couldn't you be grouping?
couldn't they be grouping? 	couldn't I have grouped?
couldn't you have grouped?
couldn't she have grouped?
couldn't we have grouped?
couldn't you have grouped?
couldn't they have grouped? 	couldn't I have been grouping?
couldn't you have been grouping?
couldn't she have been grouping?
couldn't we have been grouping?
couldn't you have been grouping?
couldn't they have been grouping?