English verb conjugation
COULD RETUNE

Regular verb: retune - retuned - retuned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?