English verb conjugation
CAN RIBBOR

Regular verb: ribbor - ribbored - ribbored

Affirmation

Simple form	V-ing form
I can ribbor you can ribbor he can ribbor we can ribbor you can ribbor they can ribbor	I can be ribboring you can be ribboring he can be ribboring we can be ribboring you can be ribboring they can be ribboring
Perfect	V-ing perfect
I can have ribbored you can have ribbored he can have ribbored we can have ribbored you can have ribbored they can have ribbored	I can have been ribboring you can have been ribboring he can have been ribboring we can have been ribboring you can have been ribboring they can have been ribboring

Negation

Simple form	V-ing form
I cannot ribbor you cannot ribbor he cannot ribbor we cannot ribbor you cannot ribbor they cannot ribbor	I cannot be ribboring you cannot be ribboring he cannot be ribboring we cannot be ribboring you cannot be ribboring they cannot be ribboring
Perfect	V-ing perfect
I cannot have ribbored you cannot have ribbored he cannot have ribbored we cannot have ribbored you cannot have ribbored they cannot have ribbored	I cannot have been ribboring you cannot have been ribboring he cannot have been ribboring we cannot have been ribboring you cannot have been ribboring they cannot have been ribboring

Interrogative form

Simple form	V-ing form
can I ribbor? can you ribbor? can he ribbor? can we ribbor? can you ribbor? can they ribbor?	can I be ribboring? can you be ribboring? can he be ribboring? can we be ribboring? can you be ribboring? can they be ribboring?
Perfect	V-ing perfect
can I have ribbored? can you have ribbored? can he have ribbored? can we have ribbored? can you have ribbored? can they have ribbored?	can I have been ribboring? can you have been ribboring? can he have been ribboring? can we have been ribboring? can you have been ribboring? can they have been ribboring?

Interro-negative form

Simple form	V-ing form
can I not ribbor? can you not ribbor? can he not ribbor? can we not ribbor? can you not ribbor? can they not ribbor?	can I not be ribboring? can you not be ribboring? can he not be ribboring? can we not be ribboring? can you not be ribboring? can they not be ribboring?
Perfect	V-ing perfect
can I not have ribbored? can you not have ribbored? can he not have ribbored? can we not have ribbored? can you not have ribbored? can they not have ribbored?	can I not have been ribboring? can you not have been ribboring? can he not have been ribboring? can we not have been ribboring? can you not have been ribboring? can they not have been ribboring?