could lip
Regular verb: lip - liped- liped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lip
you could lip
she could lip
we could lip
you could lip
they could lip 	I could be liping
you could be liping
she could be liping
we could be liping
you could be liping
they could be liping	I could have liped
you could have liped
she could have liped
we could have liped
you could have liped
they could have liped	I could have been liping
you could have been liping
she could have been liping
we could have been liping
you could have been liping
they could have been liping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not lip
you could not lip
she could not lip
we could not lip
you could not lip
they could not lip 	I could not be liping
you could not be liping
she could not be liping
we could not be liping
you could not be liping
they could not be liping	I could not have liped
you could not have liped
she could not have liped
we could not have liped
you could not have liped
they could not have liped	I could not have been liping
you could not have been liping
she could not have been liping
we could not have been liping
you could not have been liping
they could not have been liping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lip?
could you lip?
could she lip?
could we lip?
could you lip?
could they lip? 	could I be liping?
could you be liping?
could she be liping?
could we be liping?
could you be liping?
could they be liping? 	could I have liped?
could you have liped?
could she have liped?
could we have liped?
could you have liped?
could they have liped? 	could I have been liping?
could you have been liping?
could she have been liping?
could we have been liping?
could you have been liping?
could they have been liping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not lip?
could you not lip?
could she not lip?
could we not lip?
could you not lip?
could they not lip? 	could I not be liping?
could you not be liping?
could she not be liping?
could we not be liping?
could you not be liping?
could they not be liping? 	could I not have liped?
could you not have liped?
could she not have liped?
could we not have liped?
could you not have liped?
could they not have liped? 	could I not have been liping?
could you not have been liping?
could she not have been liping?
could we not have been liping?
could you not have been liping?
could they not have been liping?