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
she can alter
we can alter
you can alter
they can alter 	I can be altering
you can be altering
she can be altering
we can be altering
you can be altering
they can be altering	I can have altered
you can have altered
she 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
she 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 cannot alter
you cannot alter
she cannot alter
we cannot alter
you cannot alter
they cannot alter 	I cannot be altering
you cannot be altering
she cannot be altering
we cannot be altering
you cannot be altering
they cannot be altering	I cannot have altered
you cannot have altered
she cannot have altered
we cannot have altered
you cannot have altered
they cannot have altered	I cannot have been altering
you cannot have been altering
she cannot have been altering
we cannot have been altering
you cannot have been altering
they cannot have been altering	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I alter?
can you alter?
can she alter?
can we alter?
can you alter?
can they alter? 	can I be altering?
can you be altering?
can she be altering?
can we be altering?
can you be altering?
can they be altering? 	can I have altered?
can you have altered?
can she 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 she 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 I not alter?
can you not alter?
can she not alter?
can we not alter?
can you not alter?
can they not alter? 	can I not be altering?
can you not be altering?
can she not be altering?
can we not be altering?
can you not be altering?
can they not be altering? 	can I not have altered?
can you not have altered?
can she not have altered?
can we not have altered?
can you not have altered?
can they not have altered? 	can I not have been altering?
can you not have been altering?
can she not have been altering?
can we not have been altering?
can you not have been altering?
can they not have been altering?