could refuse
Regular verb: refuse - refused- refused

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could refuse
you could refuse
she could refuse
we could refuse
you could refuse
they could refuse 	I could be refusing
you could be refusing
she could be refusing
we could be refusing
you could be refusing
they could be refusing	I could have refused
you could have refused
she could have refused
we could have refused
you could have refused
they could have refused	I could have been refusing
you could have been refusing
she could have been refusing
we could have been refusing
you could have been refusing
they could have been refusing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't refuse
you couldn't refuse
she couldn't refuse
we couldn't refuse
you couldn't refuse
they couldn't refuse 	I couldn't be refusing
you couldn't be refusing
she couldn't be refusing
we couldn't be refusing
you couldn't be refusing
they couldn't be refusing	I couldn't have refused
you couldn't have refused
she couldn't have refused
we couldn't have refused
you couldn't have refused
they couldn't have refused	I couldn't have been refusing
you couldn't have been refusing
she couldn't have been refusing
we couldn't have been refusing
you couldn't have been refusing
they couldn't have been refusing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I refuse?
could you refuse?
could she refuse?
could we refuse?
could you refuse?
could they refuse? 	could I be refusing?
could you be refusing?
could she be refusing?
could we be refusing?
could you be refusing?
could they be refusing? 	could I have refused?
could you have refused?
could she have refused?
could we have refused?
could you have refused?
could they have refused? 	could I have been refusing?
could you have been refusing?
could she have been refusing?
could we have been refusing?
could you have been refusing?
could they have been refusing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I refuse?
couldn't you refuse?
couldn't she refuse?
couldn't we refuse?
couldn't you refuse?
couldn't they refuse? 	couldn't I be refusing?
couldn't you be refusing?
couldn't she be refusing?
couldn't we be refusing?
couldn't you be refusing?
couldn't they be refusing? 	couldn't I have refused?
couldn't you have refused?
couldn't she have refused?
couldn't we have refused?
couldn't you have refused?
couldn't they have refused? 	couldn't I have been refusing?
couldn't you have been refusing?
couldn't she have been refusing?
couldn't we have been refusing?
couldn't you have been refusing?
couldn't they have been refusing?