could nickname
Regular verb: nickname - nicknamed- nicknamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could nickname
you could nickname
he could nickname
we could nickname
you could nickname
they could nickname 	I could be nicknaming
you could be nicknaming
he could be nicknaming
we could be nicknaming
you could be nicknaming
they could be nicknaming	I could have nicknamed
you could have nicknamed
he could have nicknamed
we could have nicknamed
you could have nicknamed
they could have nicknamed	I could have been nicknaming
you could have been nicknaming
he could have been nicknaming
we could have been nicknaming
you could have been nicknaming
they could have been nicknaming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not nickname
you could not nickname
he could not nickname
we could not nickname
you could not nickname
they could not nickname 	I could not be nicknaming
you could not be nicknaming
he could not be nicknaming
we could not be nicknaming
you could not be nicknaming
they could not be nicknaming	I could not have nicknamed
you could not have nicknamed
he could not have nicknamed
we could not have nicknamed
you could not have nicknamed
they could not have nicknamed	I could not have been nicknaming
you could not have been nicknaming
he could not have been nicknaming
we could not have been nicknaming
you could not have been nicknaming
they could not have been nicknaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I nickname?
could you nickname?
could he nickname?
could we nickname?
could you nickname?
could they nickname? 	could I be nicknaming?
could you be nicknaming?
could he be nicknaming?
could we be nicknaming?
could you be nicknaming?
could they be nicknaming? 	could I have nicknamed?
could you have nicknamed?
could he have nicknamed?
could we have nicknamed?
could you have nicknamed?
could they have nicknamed? 	could I have been nicknaming?
could you have been nicknaming?
could he have been nicknaming?
could we have been nicknaming?
could you have been nicknaming?
could they have been nicknaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not nickname?
could you not nickname?
could he not nickname?
could we not nickname?
could you not nickname?
could they not nickname? 	could I not be nicknaming?
could you not be nicknaming?
could he not be nicknaming?
could we not be nicknaming?
could you not be nicknaming?
could they not be nicknaming? 	could I not have nicknamed?
could you not have nicknamed?
could he not have nicknamed?
could we not have nicknamed?
could you not have nicknamed?
could they not have nicknamed? 	could I not have been nicknaming?
could you not have been nicknaming?
could he not have been nicknaming?
could we not have been nicknaming?
could you not have been nicknaming?
could they not have been nicknaming?