could nip
Regular verb: nip - nipped- nipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?