English verb conjugation
COULD STING

Irregular verb: sting - stung - stung

Affirmation

Simple form	V-ing form
I could sting you could sting he could sting we could sting you could sting they could sting	I could be stinging you could be stinging he could be stinging we could be stinging you could be stinging they could be stinging
Perfect	V-ing perfect
I could have stung you could have stung he could have stung we could have stung you could have stung they could have stung	I could have been stinging you could have been stinging he could have been stinging we could have been stinging you could have been stinging they could have been stinging

Negation

Simple form	V-ing form
I couldn't sting you couldn't sting he couldn't sting we couldn't sting you couldn't sting they couldn't sting	I couldn't be stinging you couldn't be stinging he couldn't be stinging we couldn't be stinging you couldn't be stinging they couldn't be stinging
Perfect	V-ing perfect
I couldn't have stung you couldn't have stung he couldn't have stung we couldn't have stung you couldn't have stung they couldn't have stung	I couldn't have been stinging you couldn't have been stinging he couldn't have been stinging we couldn't have been stinging you couldn't have been stinging they couldn't have been stinging

Interrogative form

Simple form	V-ing form
could I sting? could you sting? could he sting? could we sting? could you sting? could they sting?	could I be stinging? could you be stinging? could he be stinging? could we be stinging? could you be stinging? could they be stinging?
Perfect	V-ing perfect
could I have stung? could you have stung? could he have stung? could we have stung? could you have stung? could they have stung?	could I have been stinging? could you have been stinging? could he have been stinging? could we have been stinging? could you have been stinging? could they have been stinging?

Interro-negative form

Simple form	V-ing form
couldn't I sting? couldn't you sting? couldn't he sting? couldn't we sting? couldn't you sting? couldn't they sting?	couldn't I be stinging? couldn't you be stinging? couldn't he be stinging? couldn't we be stinging? couldn't you be stinging? couldn't they be stinging?
Perfect	V-ing perfect
couldn't I have stung? couldn't you have stung? couldn't he have stung? couldn't we have stung? couldn't you have stung? couldn't they have stung?	couldn't I have been stinging? couldn't you have been stinging? couldn't he have been stinging? couldn't we have been stinging? couldn't you have been stinging? couldn't they have been stinging?