could retune
Regular verb: retune - retuned- retuned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could retune
you could retune
she could retune
we could retune
you could retune
they could retune 	I could be retuning
you could be retuning
she could be retuning
we could be retuning
you could be retuning
they could be retuning	I could have retuned
you could have retuned
she could have retuned
we could have retuned
you could have retuned
they could have retuned	I could have been retuning
you could have been retuning
she could have been retuning
we could have been retuning
you could have been retuning
they could have been retuning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not retune
you could not retune
she could not retune
we could not retune
you could not retune
they could not retune 	I could not be retuning
you could not be retuning
she could not be retuning
we could not be retuning
you could not be retuning
they could not be retuning	I could not have retuned
you could not have retuned
she could not have retuned
we could not have retuned
you could not have retuned
they could not have retuned	I could not have been retuning
you could not have been retuning
she could not have been retuning
we could not have been retuning
you could not have been retuning
they could not have been retuning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I retune?
could you retune?
could she retune?
could we retune?
could you retune?
could they retune? 	could I be retuning?
could you be retuning?
could she be retuning?
could we be retuning?
could you be retuning?
could they be retuning? 	could I have retuned?
could you have retuned?
could she have retuned?
could we have retuned?
could you have retuned?
could they have retuned? 	could I have been retuning?
could you have been retuning?
could she have been retuning?
could we have been retuning?
could you have been retuning?
could they have been retuning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not retune?
could you not retune?
could she not retune?
could we not retune?
could you not retune?
could they not retune? 	could I not be retuning?
could you not be retuning?
could she not be retuning?
could we not be retuning?
could you not be retuning?
could they not be retuning? 	could I not have retuned?
could you not have retuned?
could she not have retuned?
could we not have retuned?
could you not have retuned?
could they not have retuned? 	could I not have been retuning?
could you not have been retuning?
could she not have been retuning?
could we not have been retuning?
could you not have been retuning?
could they not have been retuning?