can center
Regular verb: center - centered- centered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can center
you can center
he can center
we can center
you can center
they can center 	I can be centering
you can be centering
he can be centering
we can be centering
you can be centering
they can be centering	I can have centered
you can have centered
he can have centered
we can have centered
you can have centered
they can have centered	I can have been centering
you can have been centering
he can have been centering
we can have been centering
you can have been centering
they can have been centering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't center
you can't center
he can't center
we can't center
you can't center
they can't center 	I can't be centering
you can't be centering
he can't be centering
we can't be centering
you can't be centering
they can't be centering	I can't have centered
you can't have centered
he can't have centered
we can't have centered
you can't have centered
they can't have centered	I can't have been centering
you can't have been centering
he can't have been centering
we can't have been centering
you can't have been centering
they can't have been centering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I center?
can you center?
can he center?
can we center?
can you center?
can they center? 	can I be centering?
can you be centering?
can he be centering?
can we be centering?
can you be centering?
can they be centering? 	can I have centered?
can you have centered?
can he have centered?
can we have centered?
can you have centered?
can they have centered? 	can I have been centering?
can you have been centering?
can he have been centering?
can we have been centering?
can you have been centering?
can they have been centering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I center?
can't you center?
can't he center?
can't we center?
can't you center?
can't they center? 	can't I be centering?
can't you be centering?
can't he be centering?
can't we be centering?
can't you be centering?
can't they be centering? 	can't I have centered?
can't you have centered?
can't he have centered?
can't we have centered?
can't you have centered?
can't they have centered? 	can't I have been centering?
can't you have been centering?
can't he have been centering?
can't we have been centering?
can't you have been centering?
can't they have been centering?