Conjugación del verbo inglés
CAN ALTER

Verbo regular: alter - altered - altered

Afirmación

Forma simple	Forma 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
Perfecto	Perfecto con V-ing
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

Negación

Forma simple	Forma 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
Perfecto	Perfecto con V-ing
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 simple	Forma 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?
Perfecto	Perfecto con V-ing
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 simple	Forma 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?
Perfecto	Perfecto con V-ing
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?