English verb conjugation
CAN RETURN

Regular verb: return - returned - returned

Affirmation

Simple form	V-ing form
I can return you can return he can return we can return you can return they can return	I can be returning you can be returning he can be returning we can be returning you can be returning they can be returning
Perfect	V-ing perfect
I can have returned you can have returned he can have returned we can have returned you can have returned they can have returned	I can have been returning you can have been returning he can have been returning we can have been returning you can have been returning they can have been returning

Negation

Simple form	V-ing form
I cannot return you cannot return he cannot return we cannot return you cannot return they cannot return	I cannot be returning you cannot be returning he cannot be returning we cannot be returning you cannot be returning they cannot be returning
Perfect	V-ing perfect
I cannot have returned you cannot have returned he cannot have returned we cannot have returned you cannot have returned they cannot have returned	I cannot have been returning you cannot have been returning he cannot have been returning we cannot have been returning you cannot have been returning they cannot have been returning

Interrogative form

Simple form	V-ing form
can I return? can you return? can he return? can we return? can you return? can they return?	can I be returning? can you be returning? can he be returning? can we be returning? can you be returning? can they be returning?
Perfect	V-ing perfect
can I have returned? can you have returned? can he have returned? can we have returned? can you have returned? can they have returned?	can I have been returning? can you have been returning? can he have been returning? can we have been returning? can you have been returning? can they have been returning?

Interro-negative form

Simple form	V-ing form
can I not return? can you not return? can he not return? can we not return? can you not return? can they not return?	can I not be returning? can you not be returning? can he not be returning? can we not be returning? can you not be returning? can they not be returning?
Perfect	V-ing perfect
can I not have returned? can you not have returned? can he not have returned? can we not have returned? can you not have returned? can they not have returned?	can I not have been returning? can you not have been returning? can he not have been returning? can we not have been returning? can you not have been returning? can they not have been returning?