can prealter
Regular verb: prealter - prealtered- prealtered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can prealter
you can prealter
she can prealter
we can prealter
you can prealter
they can prealter 	I can be prealtering
you can be prealtering
she can be prealtering
we can be prealtering
you can be prealtering
they can be prealtering	I can have prealtered
you can have prealtered
she can have prealtered
we can have prealtered
you can have prealtered
they can have prealtered	I can have been prealtering
you can have been prealtering
she can have been prealtering
we can have been prealtering
you can have been prealtering
they can have been prealtering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't prealter
you can't prealter
she can't prealter
we can't prealter
you can't prealter
they can't prealter 	I can't be prealtering
you can't be prealtering
she can't be prealtering
we can't be prealtering
you can't be prealtering
they can't be prealtering	I can't have prealtered
you can't have prealtered
she can't have prealtered
we can't have prealtered
you can't have prealtered
they can't have prealtered	I can't have been prealtering
you can't have been prealtering
she can't have been prealtering
we can't have been prealtering
you can't have been prealtering
they can't have been prealtering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I prealter?
can you prealter?
can she prealter?
can we prealter?
can you prealter?
can they prealter? 	can I be prealtering?
can you be prealtering?
can she be prealtering?
can we be prealtering?
can you be prealtering?
can they be prealtering? 	can I have prealtered?
can you have prealtered?
can she have prealtered?
can we have prealtered?
can you have prealtered?
can they have prealtered? 	can I have been prealtering?
can you have been prealtering?
can she have been prealtering?
can we have been prealtering?
can you have been prealtering?
can they have been prealtering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I prealter?
can't you prealter?
can't she prealter?
can't we prealter?
can't you prealter?
can't they prealter? 	can't I be prealtering?
can't you be prealtering?
can't she be prealtering?
can't we be prealtering?
can't you be prealtering?
can't they be prealtering? 	can't I have prealtered?
can't you have prealtered?
can't she have prealtered?
can't we have prealtered?
can't you have prealtered?
can't they have prealtered? 	can't I have been prealtering?
can't you have been prealtering?
can't she have been prealtering?
can't we have been prealtering?
can't you have been prealtering?
can't they have been prealtering?