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 couldn't nip you couldn't nip he couldn't nip we couldn't nip you couldn't nip they couldn't nip	I couldn't be nipping you couldn't be nipping he couldn't be nipping we couldn't be nipping you couldn't be nipping they couldn't be nipping
Perfect	V-ing perfect
I couldn't have nipped you couldn't have nipped he couldn't have nipped we couldn't have nipped you couldn't have nipped they couldn't have nipped	I couldn't have been nipping you couldn't have been nipping he couldn't have been nipping we couldn't have been nipping you couldn't have been nipping they couldn't 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
couldn't I nip? couldn't you nip? couldn't he nip? couldn't we nip? couldn't you nip? couldn't they nip?	couldn't I be nipping? couldn't you be nipping? couldn't he be nipping? couldn't we be nipping? couldn't you be nipping? couldn't they be nipping?
Perfect	V-ing perfect
couldn't I have nipped? couldn't you have nipped? couldn't he have nipped? couldn't we have nipped? couldn't you have nipped? couldn't they have nipped?	couldn't I have been nipping? couldn't you have been nipping? couldn't he have been nipping? couldn't we have been nipping? couldn't you have been nipping? couldn't they have been nipping?