could nip
Regular verb: nip - nipped- nipped

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