English verb conjugation
CAN BELIEVE

Regular verb: believe - believed - believed

Affirmation

Simple form	V-ing form
I can believe you can believe she can believe we can believe you can believe they can believe	I can be believing you can be believing she can be believing we can be believing you can be believing they can be believing
Perfect	V-ing perfect
I can have believed you can have believed she can have believed we can have believed you can have believed they can have believed	I can have been believing you can have been believing she can have been believing we can have been believing you can have been believing they can have been believing

Negation

Simple form	V-ing form
I cannot believe you cannot believe she cannot believe we cannot believe you cannot believe they cannot believe	I cannot be believing you cannot be believing she cannot be believing we cannot be believing you cannot be believing they cannot be believing
Perfect	V-ing perfect
I cannot have believed you cannot have believed she cannot have believed we cannot have believed you cannot have believed they cannot have believed	I cannot have been believing you cannot have been believing she cannot have been believing we cannot have been believing you cannot have been believing they cannot have been believing

Interrogative form

Simple form	V-ing form
can I believe? can you believe? can she believe? can we believe? can you believe? can they believe?	can I be believing? can you be believing? can she be believing? can we be believing? can you be believing? can they be believing?
Perfect	V-ing perfect
can I have believed? can you have believed? can she have believed? can we have believed? can you have believed? can they have believed?	can I have been believing? can you have been believing? can she have been believing? can we have been believing? can you have been believing? can they have been believing?

Interro-negative form

Simple form	V-ing form
can I not believe? can you not believe? can she not believe? can we not believe? can you not believe? can they not believe?	can I not be believing? can you not be believing? can she not be believing? can we not be believing? can you not be believing? can they not be believing?
Perfect	V-ing perfect
can I not have believed? can you not have believed? can she not have believed? can we not have believed? can you not have believed? can they not have believed?	can I not have been believing? can you not have been believing? can she not have been believing? can we not have been believing? can you not have been believing? can they not have been believing?