could retort
Regular verb: retort - retorted- retorted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could retort
you could retort
he could retort
we could retort
you could retort
they could retort 	I could be retorting
you could be retorting
he could be retorting
we could be retorting
you could be retorting
they could be retorting	I could have retorted
you could have retorted
he could have retorted
we could have retorted
you could have retorted
they could have retorted	I could have been retorting
you could have been retorting
he could have been retorting
we could have been retorting
you could have been retorting
they could have been retorting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't retort
you couldn't retort
he couldn't retort
we couldn't retort
you couldn't retort
they couldn't retort 	I couldn't be retorting
you couldn't be retorting
he couldn't be retorting
we couldn't be retorting
you couldn't be retorting
they couldn't be retorting	I couldn't have retorted
you couldn't have retorted
he couldn't have retorted
we couldn't have retorted
you couldn't have retorted
they couldn't have retorted	I couldn't have been retorting
you couldn't have been retorting
he couldn't have been retorting
we couldn't have been retorting
you couldn't have been retorting
they couldn't have been retorting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I retort?
could you retort?
could he retort?
could we retort?
could you retort?
could they retort? 	could I be retorting?
could you be retorting?
could he be retorting?
could we be retorting?
could you be retorting?
could they be retorting? 	could I have retorted?
could you have retorted?
could he have retorted?
could we have retorted?
could you have retorted?
could they have retorted? 	could I have been retorting?
could you have been retorting?
could he have been retorting?
could we have been retorting?
could you have been retorting?
could they have been retorting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I retort?
couldn't you retort?
couldn't he retort?
couldn't we retort?
couldn't you retort?
couldn't they retort? 	couldn't I be retorting?
couldn't you be retorting?
couldn't he be retorting?
couldn't we be retorting?
couldn't you be retorting?
couldn't they be retorting? 	couldn't I have retorted?
couldn't you have retorted?
couldn't he have retorted?
couldn't we have retorted?
couldn't you have retorted?
couldn't they have retorted? 	couldn't I have been retorting?
couldn't you have been retorting?
couldn't he have been retorting?
couldn't we have been retorting?
couldn't you have been retorting?
couldn't they have been retorting?