English verb conjugation
COULD RING

Irregular verb: ring - rang - rung

Affirmation

Simple form	V-ing form
I could ring you could ring she could ring we could ring you could ring they could ring	I could be ringing you could be ringing she could be ringing we could be ringing you could be ringing they could be ringing
Perfect	V-ing perfect
I could have rung you could have rung she could have rung we could have rung you could have rung they could have rung	I could have been ringing you could have been ringing she could have been ringing we could have been ringing you could have been ringing they could have been ringing

Negation

Simple form	V-ing form
I could not ring you could not ring she could not ring we could not ring you could not ring they could not ring	I could not be ringing you could not be ringing she could not be ringing we could not be ringing you could not be ringing they could not be ringing
Perfect	V-ing perfect
I could not have rung you could not have rung she could not have rung we could not have rung you could not have rung they could not have rung	I could not have been ringing you could not have been ringing she could not have been ringing we could not have been ringing you could not have been ringing they could not have been ringing

Interrogative form

Simple form	V-ing form
could I ring? could you ring? could she ring? could we ring? could you ring? could they ring?	could I be ringing? could you be ringing? could she be ringing? could we be ringing? could you be ringing? could they be ringing?
Perfect	V-ing perfect
could I have rung? could you have rung? could she have rung? could we have rung? could you have rung? could they have rung?	could I have been ringing? could you have been ringing? could she have been ringing? could we have been ringing? could you have been ringing? could they have been ringing?

Interro-negative form

Simple form	V-ing form
could I not ring? could you not ring? could she not ring? could we not ring? could you not ring? could they not ring?	could I not be ringing? could you not be ringing? could she not be ringing? could we not be ringing? could you not be ringing? could they not be ringing?
Perfect	V-ing perfect
could I not have rung? could you not have rung? could she not have rung? could we not have rung? could you not have rung? could they not have rung?	could I not have been ringing? could you not have been ringing? could she not have been ringing? could we not have been ringing? could you not have been ringing? could they not have been ringing?