English verb conjugation
CAN REFUSE

Regular verb: refuse - refused - refused

Affirmation

Simple form	V-ing form
I can refuse you can refuse he can refuse we can refuse you can refuse they can refuse	I can be refusing you can be refusing he can be refusing we can be refusing you can be refusing they can be refusing
Perfect	V-ing perfect
I can have refused you can have refused he can have refused we can have refused you can have refused they can have refused	I can have been refusing you can have been refusing he can have been refusing we can have been refusing you can have been refusing they can have been refusing

Negation

Simple form	V-ing form
I can't refuse you can't refuse he can't refuse we can't refuse you can't refuse they can't refuse	I can't be refusing you can't be refusing he can't be refusing we can't be refusing you can't be refusing they can't be refusing
Perfect	V-ing perfect
I can't have refused you can't have refused he can't have refused we can't have refused you can't have refused they can't have refused	I can't have been refusing you can't have been refusing he can't have been refusing we can't have been refusing you can't have been refusing they can't have been refusing

Interrogative form

Simple form	V-ing form
can I refuse? can you refuse? can he refuse? can we refuse? can you refuse? can they refuse?	can I be refusing? can you be refusing? can he be refusing? can we be refusing? can you be refusing? can they be refusing?
Perfect	V-ing perfect
can I have refused? can you have refused? can he have refused? can we have refused? can you have refused? can they have refused?	can I have been refusing? can you have been refusing? can he have been refusing? can we have been refusing? can you have been refusing? can they have been refusing?

Interro-negative form

Simple form	V-ing form
can't I refuse? can't you refuse? can't he refuse? can't we refuse? can't you refuse? can't they refuse?	can't I be refusing? can't you be refusing? can't he be refusing? can't we be refusing? can't you be refusing? can't they be refusing?
Perfect	V-ing perfect
can't I have refused? can't you have refused? can't he have refused? can't we have refused? can't you have refused? can't they have refused?	can't I have been refusing? can't you have been refusing? can't he have been refusing? can't we have been refusing? can't you have been refusing? can't they have been refusing?