could prealter
Verbe régulier : prealter - prealtered- prealtered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could prealter
you could prealter
he could prealter
we could prealter
you could prealter
they could prealter 	I could be prealtering
you could be prealtering
he could be prealtering
we could be prealtering
you could be prealtering
they could be prealtering	I could have prealtered
you could have prealtered
he could have prealtered
we could have prealtered
you could have prealtered
they could have prealtered	I could have been prealtering
you could have been prealtering
he could have been prealtering
we could have been prealtering
you could have been prealtering
they could have been prealtering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't prealter
you couldn't prealter
he couldn't prealter
we couldn't prealter
you couldn't prealter
they couldn't prealter 	I couldn't be prealtering
you couldn't be prealtering
he couldn't be prealtering
we couldn't be prealtering
you couldn't be prealtering
they couldn't be prealtering	I couldn't have prealtered
you couldn't have prealtered
he couldn't have prealtered
we couldn't have prealtered
you couldn't have prealtered
they couldn't have prealtered	I couldn't have been prealtering
you couldn't have been prealtering
he couldn't have been prealtering
we couldn't have been prealtering
you couldn't have been prealtering
they couldn't have been prealtering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I prealter?
could you prealter?
could he prealter?
could we prealter?
could you prealter?
could they prealter? 	could I be prealtering?
could you be prealtering?
could he be prealtering?
could we be prealtering?
could you be prealtering?
could they be prealtering? 	could I have prealtered?
could you have prealtered?
could he have prealtered?
could we have prealtered?
could you have prealtered?
could they have prealtered? 	could I have been prealtering?
could you have been prealtering?
could he have been prealtering?
could we have been prealtering?
could you have been prealtering?
could they have been prealtering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I prealter?
couldn't you prealter?
couldn't he prealter?
couldn't we prealter?
couldn't you prealter?
couldn't they prealter? 	couldn't I be prealtering?
couldn't you be prealtering?
couldn't he be prealtering?
couldn't we be prealtering?
couldn't you be prealtering?
couldn't they be prealtering? 	couldn't I have prealtered?
couldn't you have prealtered?
couldn't he have prealtered?
couldn't we have prealtered?
couldn't you have prealtered?
couldn't they have prealtered? 	couldn't I have been prealtering?
couldn't you have been prealtering?
couldn't he have been prealtering?
couldn't we have been prealtering?
couldn't you have been prealtering?
couldn't they have been prealtering?