English verb conjugation
COULD RADIO

Regular verb: radio - radioed - radioed

Affirmation

Simple form	V-ing form
I could radio you could radio he could radio we could radio you could radio they could radio	I could be radioing you could be radioing he could be radioing we could be radioing you could be radioing they could be radioing
Perfect	V-ing perfect
I could have radioed you could have radioed he could have radioed we could have radioed you could have radioed they could have radioed	I could have been radioing you could have been radioing he could have been radioing we could have been radioing you could have been radioing they could have been radioing

Negation

Simple form	V-ing form
I could not radio you could not radio he could not radio we could not radio you could not radio they could not radio	I could not be radioing you could not be radioing he could not be radioing we could not be radioing you could not be radioing they could not be radioing
Perfect	V-ing perfect
I could not have radioed you could not have radioed he could not have radioed we could not have radioed you could not have radioed they could not have radioed	I could not have been radioing you could not have been radioing he could not have been radioing we could not have been radioing you could not have been radioing they could not have been radioing

Interrogative form

Simple form	V-ing form
could I radio? could you radio? could he radio? could we radio? could you radio? could they radio?	could I be radioing? could you be radioing? could he be radioing? could we be radioing? could you be radioing? could they be radioing?
Perfect	V-ing perfect
could I have radioed? could you have radioed? could he have radioed? could we have radioed? could you have radioed? could they have radioed?	could I have been radioing? could you have been radioing? could he have been radioing? could we have been radioing? could you have been radioing? could they have been radioing?

Interro-negative form

Simple form	V-ing form
could I not radio? could you not radio? could he not radio? could we not radio? could you not radio? could they not radio?	could I not be radioing? could you not be radioing? could he not be radioing? could we not be radioing? could you not be radioing? could they not be radioing?
Perfect	V-ing perfect
could I not have radioed? could you not have radioed? could he not have radioed? could we not have radioed? could you not have radioed? could they not have radioed?	could I not have been radioing? could you not have been radioing? could he not have been radioing? could we not have been radioing? could you not have been radioing? could they not have been radioing?