English verb conjugation
COULD RETUNE

Regular verb: retune - retuned - retuned

Affirmation

Simple form	V-ing form
I could retune you could retune he could retune we could retune you could retune they could retune	I could be retuning you could be retuning he 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 he 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 he 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 he 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 he 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 he 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 he 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 he retune? could we retune? could you retune? could they retune?	could I be retuning? could you be retuning? could he 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 he 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 he 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 he 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 he 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 he 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 he not have been retuning? could we not have been retuning? could you not have been retuning? could they not have been retuning?