English verb conjugation
CAN RETUNE

Regular verb: retune - retuned - retuned

Affirmation

Simple form	V-ing form
I can retune you can retune he can retune we can retune you can retune they can retune	I can be retuning you can be retuning he can be retuning we can be retuning you can be retuning they can be retuning
Perfect	V-ing perfect
I can have retuned you can have retuned he can have retuned we can have retuned you can have retuned they can have retuned	I can have been retuning you can have been retuning he can have been retuning we can have been retuning you can have been retuning they can have been retuning

Negation

Simple form	V-ing form
I cannot retune you cannot retune he cannot retune we cannot retune you cannot retune they cannot retune	I cannot be retuning you cannot be retuning he cannot be retuning we cannot be retuning you cannot be retuning they cannot be retuning
Perfect	V-ing perfect
I cannot have retuned you cannot have retuned he cannot have retuned we cannot have retuned you cannot have retuned they cannot have retuned	I cannot have been retuning you cannot have been retuning he cannot have been retuning we cannot have been retuning you cannot have been retuning they cannot have been retuning

Interrogative form

Simple form	V-ing form
can I retune? can you retune? can he retune? can we retune? can you retune? can they retune?	can I be retuning? can you be retuning? can he be retuning? can we be retuning? can you be retuning? can they be retuning?
Perfect	V-ing perfect
can I have retuned? can you have retuned? can he have retuned? can we have retuned? can you have retuned? can they have retuned?	can I have been retuning? can you have been retuning? can he have been retuning? can we have been retuning? can you have been retuning? can they have been retuning?

Interro-negative form

Simple form	V-ing form
can I not retune? can you not retune? can he not retune? can we not retune? can you not retune? can they not retune?	can I not be retuning? can you not be retuning? can he not be retuning? can we not be retuning? can you not be retuning? can they not be retuning?
Perfect	V-ing perfect
can I not have retuned? can you not have retuned? can he not have retuned? can we not have retuned? can you not have retuned? can they not have retuned?	can I not have been retuning? can you not have been retuning? can he not have been retuning? can we not have been retuning? can you not have been retuning? can they not have been retuning?