English verb conjugation
COULD NIP

Regular verb: nip - nipped - nipped

Affirmation

Simple form	V-ing form
I could nip you could nip he could nip we could nip you could nip they could nip	I could be nipping you could be nipping he could be nipping we could be nipping you could be nipping they could be nipping
Perfect	V-ing perfect
I could have nipped you could have nipped he could have nipped we could have nipped you could have nipped they could have nipped	I could have been nipping you could have been nipping he could have been nipping we could have been nipping you could have been nipping they could have been nipping

Negation

Simple form	V-ing form
I could not nip you could not nip he could not nip we could not nip you could not nip they could not nip	I could not be nipping you could not be nipping he could not be nipping we could not be nipping you could not be nipping they could not be nipping
Perfect	V-ing perfect
I could not have nipped you could not have nipped he could not have nipped we could not have nipped you could not have nipped they could not have nipped	I could not have been nipping you could not have been nipping he could not have been nipping we could not have been nipping you could not have been nipping they could not have been nipping

Interrogative form

Simple form	V-ing form
could I nip? could you nip? could he nip? could we nip? could you nip? could they nip?	could I be nipping? could you be nipping? could he be nipping? could we be nipping? could you be nipping? could they be nipping?
Perfect	V-ing perfect
could I have nipped? could you have nipped? could he have nipped? could we have nipped? could you have nipped? could they have nipped?	could I have been nipping? could you have been nipping? could he have been nipping? could we have been nipping? could you have been nipping? could they have been nipping?

Interro-negative form

Simple form	V-ing form
could I not nip? could you not nip? could he not nip? could we not nip? could you not nip? could they not nip?	could I not be nipping? could you not be nipping? could he not be nipping? could we not be nipping? could you not be nipping? could they not be nipping?
Perfect	V-ing perfect
could I not have nipped? could you not have nipped? could he not have nipped? could we not have nipped? could you not have nipped? could they not have nipped?	could I not have been nipping? could you not have been nipping? could he not have been nipping? could we not have been nipping? could you not have been nipping? could they not have been nipping?