English verb conjugation CAN ALTER

Regular verb: alter - altered - altered

Affirmation

Simple form

I can alter
you can alter
he can alter
we can alter
you can alter
they can alter

V-ing form

I can be altering
you can be altering
he can be altering
we can be altering
you can be altering
they can be altering

Perfect

I can have altered
you can have altered
he can have altered
we can have altered
you can have altered
they can have altered

V-ing perfect

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

Negation

Simple form

I cannot alter
you cannot alter
he cannot alter
we cannot alter
you cannot alter
they cannot alter

V-ing form

I cannot be altering
you cannot be altering
he cannot be altering
we cannot be altering
you cannot be altering
they cannot be altering

Perfect

I cannot have altered
you cannot have altered
he cannot have altered
we cannot have altered
you cannot have altered
they cannot have altered

V-ing perfect

I cannot have been altering
you cannot have been altering
he cannot have been altering
we cannot have been altering
you cannot have been altering
they cannot have been altering

Interrogative form

Simple form

can I alter?
can you alter?
can he alter?
can we alter?
can you alter?
can they alter?

V-ing form

can I be altering?
can you be altering?
can he be altering?
can we be altering?
can you be altering?
can they be altering?

Perfect

can I have altered?
can you have altered?
can he have altered?
can we have altered?
can you have altered?
can they have altered?

V-ing perfect

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?

Interro-negative form

Simple form

can I not alter?
can you not alter?
can he not alter?
can we not alter?
can you not alter?
can they not alter?

V-ing form

can I not be altering?
can you not be altering?
can he not be altering?
can we not be altering?
can you not be altering?
can they not be altering?

Perfect

can I not have altered?
can you not have altered?
can he not have altered?
can we not have altered?
can you not have altered?
can they not have altered?

V-ing perfect

can I not have been altering?
can you not have been altering?
can he not have been altering?
can we not have been altering?
can you not have been altering?
can they not have been altering?

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