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 can't alter
you can't alter
he can't alter
we can't alter
you can't alter
they can't alter

V-ing form

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

Perfect

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

V-ing perfect

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

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't I alter?
can't you alter?
can't he alter?
can't we alter?
can't you alter?
can't they alter?

V-ing form

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?

Perfect

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?

V-ing perfect

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?