can believe
Regular verb: believe - believed- believed

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