Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could sting sting you could sting sting she could sting sting we could sting sting you could sting sting they could sting sting
V-ing form
I could be sting stinging you could be sting stinging she could be sting stinging we could be sting stinging you could be sting stinging they could be sting stinging
Perfect
I could have sting stinged you could have sting stinged she could have sting stinged we could have sting stinged you could have sting stinged they could have sting stinged
V-ing perfect
I could have been sting stinging you could have been sting stinging she could have been sting stinging we could have been sting stinging you could have been sting stinging they could have been sting stinging
Negation
Simple form
I could not sting sting you could not sting sting she could not sting sting we could not sting sting you could not sting sting they could not sting sting
V-ing form
I could not be sting stinging you could not be sting stinging she could not be sting stinging we could not be sting stinging you could not be sting stinging they could not be sting stinging
Perfect
I could not have sting stinged you could not have sting stinged she could not have sting stinged we could not have sting stinged you could not have sting stinged they could not have sting stinged
V-ing perfect
I could not have been sting stinging you could not have been sting stinging she could not have been sting stinging we could not have been sting stinging you could not have been sting stinging they could not have been sting stinging
Interrogative form
Simple form
could I sting sting? could you sting sting? could she sting sting? could we sting sting? could you sting sting? could they sting sting?
V-ing form
could I be sting stinging? could you be sting stinging? could she be sting stinging? could we be sting stinging? could you be sting stinging? could they be sting stinging?
Perfect
could I have sting stinged? could you have sting stinged? could she have sting stinged? could we have sting stinged? could you have sting stinged? could they have sting stinged?
V-ing perfect
could I have been sting stinging? could you have been sting stinging? could she have been sting stinging? could we have been sting stinging? could you have been sting stinging? could they have been sting stinging?
Interro-negative form
Simple form
could I not sting sting? could you not sting sting? could she not sting sting? could we not sting sting? could you not sting sting? could they not sting sting?
V-ing form
could I not be sting stinging? could you not be sting stinging? could she not be sting stinging? could we not be sting stinging? could you not be sting stinging? could they not be sting stinging?
Perfect
could I not have sting stinged? could you not have sting stinged? could she not have sting stinged? could we not have sting stinged? could you not have sting stinged? could they not have sting stinged?
V-ing perfect
could I not have been sting stinging? could you not have been sting stinging? could she not have been sting stinging? could we not have been sting stinging? could you not have been sting stinging? could they not have been sting stinging?