can prealter
Regular verb: prealter - prealtered- prealtered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can prealter
you can prealter
he can prealter
we can prealter
you can prealter
they can prealter 	I can be prealtering
you can be prealtering
he can be prealtering
we can be prealtering
you can be prealtering
they can be prealtering	I can have prealtered
you can have prealtered
he 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
he 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 cannot prealter
you cannot prealter
he cannot prealter
we cannot prealter
you cannot prealter
they cannot prealter 	I cannot be prealtering
you cannot be prealtering
he cannot be prealtering
we cannot be prealtering
you cannot be prealtering
they cannot be prealtering	I cannot have prealtered
you cannot have prealtered
he cannot have prealtered
we cannot have prealtered
you cannot have prealtered
they cannot have prealtered	I cannot have been prealtering
you cannot have been prealtering
he cannot have been prealtering
we cannot have been prealtering
you cannot have been prealtering
they cannot have been prealtering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I prealter?
can you prealter?
can he prealter?
can we prealter?
can you prealter?
can they prealter? 	can I be prealtering?
can you be prealtering?
can he be prealtering?
can we be prealtering?
can you be prealtering?
can they be prealtering? 	can I have prealtered?
can you have prealtered?
can he 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 he 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 I not prealter?
can you not prealter?
can he not prealter?
can we not prealter?
can you not prealter?
can they not prealter? 	can I not be prealtering?
can you not be prealtering?
can he not be prealtering?
can we not be prealtering?
can you not be prealtering?
can they not be prealtering? 	can I not have prealtered?
can you not have prealtered?
can he not have prealtered?
can we not have prealtered?
can you not have prealtered?
can they not have prealtered? 	can I not have been prealtering?
can you not have been prealtering?
can he not have been prealtering?
can we not have been prealtering?
can you not have been prealtering?
can they not have been prealtering?