can alter
Verbo regolare: alter - altered- altered

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I can alter
you can alter
he can alter
we can alter
you can alter
they can alter 	I can be altering
you can be altering
he can be altering
we can be altering
you can be altering
they can be altering	I can have altered
you can have altered
he can have altered
we can have altered
you can have altered
they can have altered	I can have been altering
you can have been altering
he can have been altering
we can have been altering
you can have been altering
they can have been altering	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I can't alter
you can't alter
he can't alter
we can't alter
you can't alter
they can't alter 	I can't be altering
you can't be altering
he can't be altering
we can't be altering
you can't be altering
they can't be altering	I can't have altered
you can't have altered
he can't have altered
we can't have altered
you can't have altered
they can't have altered	I can't have been altering
you can't have been altering
he can't have been altering
we can't have been altering
you can't have been altering
they can't have been altering	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I alter?
can you alter?
can he alter?
can we alter?
can you alter?
can they alter? 	can I be altering?
can you be altering?
can he be altering?
can we be altering?
can you be altering?
can they be altering? 	can I have altered?
can you have altered?
can he have altered?
can we have altered?
can you have altered?
can they have altered? 	can I have been altering?
can you have been altering?
can he have been altering?
can we have been altering?
can you have been altering?
can they have been altering? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can't I alter?
can't you alter?
can't he alter?
can't we alter?
can't you alter?
can't they alter? 	can't I be altering?
can't you be altering?
can't he be altering?
can't we be altering?
can't you be altering?
can't they be altering? 	can't I have altered?
can't you have altered?
can't he have altered?
can't we have altered?
can't you have altered?
can't they have altered? 	can't I have been altering?
can't you have been altering?
can't he have been altering?
can't we have been altering?
can't you have been altering?
can't they have been altering?