English verb conjugation
CAN BELIEVE

Regular verb: believe - believed - believed

Affirmation

Simple form	V-ing form
I can believe you can believe he can believe we can believe you can believe they can believe	I can be believing you can be believing he 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 he 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 he 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 can't believe you can't believe he can't believe we can't believe you can't believe they can't believe	I can't be believing you can't be believing he can't be believing we can't be believing you can't be believing they can't be believing
Perfect	V-ing perfect
I can't have believed you can't have believed he can't have believed we can't have believed you can't have believed they can't have believed	I can't have been believing you can't have been believing he can't have been believing we can't have been believing you can't have been believing they can't have been believing

Interrogative form

Simple form	V-ing form
can I believe? can you believe? can he believe? can we believe? can you believe? can they believe?	can I be believing? can you be believing? can he 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 he 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 he 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't I believe? can't you believe? can't he believe? can't we believe? can't you believe? can't they believe?	can't I be believing? can't you be believing? can't he be believing? can't we be believing? can't you be believing? can't they be believing?
Perfect	V-ing perfect
can't I have believed? can't you have believed? can't he have believed? can't we have believed? can't you have believed? can't they have believed?	can't I have been believing? can't you have been believing? can't he have been believing? can't we have been believing? can't you have been believing? can't they have been believing?