English verb conjugation
CAN PREALTER

Regular verb: prealter - prealtered - prealtered

Affirmation

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