I could wring you could wring he could wring we could wring you could wring they could wring
V-ing form
I could be wringing you could be wringing he could be wringing we could be wringing you could be wringing they could be wringing
Perfect
I could have wrung you could have wrung he could have wrung we could have wrung you could have wrung they could have wrung
V-ing perfect
I could have been wringing you could have been wringing he could have been wringing we could have been wringing you could have been wringing they could have been wringing
Negation
Simple form
I could not wring you could not wring he could not wring we could not wring you could not wring they could not wring
V-ing form
I could not be wringing you could not be wringing he could not be wringing we could not be wringing you could not be wringing they could not be wringing
Perfect
I could not have wrung you could not have wrung he could not have wrung we could not have wrung you could not have wrung they could not have wrung
V-ing perfect
I could not have been wringing you could not have been wringing he could not have been wringing we could not have been wringing you could not have been wringing they could not have been wringing
Interrogative form
Simple form
could I wring? could you wring? could he wring? could we wring? could you wring? could they wring?
V-ing form
could I be wringing? could you be wringing? could he be wringing? could we be wringing? could you be wringing? could they be wringing?
Perfect
could I have wrung? could you have wrung? could he have wrung? could we have wrung? could you have wrung? could they have wrung?
V-ing perfect
could I have been wringing? could you have been wringing? could he have been wringing? could we have been wringing? could you have been wringing? could they have been wringing?
Interro-negative form
Simple form
could I not wring? could you not wring? could he not wring? could we not wring? could you not wring? could they not wring?
V-ing form
could I not be wringing? could you not be wringing? could he not be wringing? could we not be wringing? could you not be wringing? could they not be wringing?
Perfect
could I not have wrung? could you not have wrung? could he not have wrung? could we not have wrung? could you not have wrung? could they not have wrung?
V-ing perfect
could I not have been wringing? could you not have been wringing? could he not have been wringing? could we not have been wringing? could you not have been wringing? could they not have been wringing?