English verb conjugation COULD EXIST

Regular verb: exist - existed - existed

Affirmation

Simple form

I could exist
you could exist
she could exist
we could exist
you could exist
they could exist

V-ing form

I could be existing
you could be existing
she could be existing
we could be existing
you could be existing
they could be existing

Perfect

I could have existed
you could have existed
she could have existed
we could have existed
you could have existed
they could have existed

V-ing perfect

I could have been existing
you could have been existing
she could have been existing
we could have been existing
you could have been existing
they could have been existing

Negation

Simple form

I couldn't exist
you couldn't exist
she couldn't exist
we couldn't exist
you couldn't exist
they couldn't exist

V-ing form

I couldn't be existing
you couldn't be existing
she couldn't be existing
we couldn't be existing
you couldn't be existing
they couldn't be existing

Perfect

I couldn't have existed
you couldn't have existed
she couldn't have existed
we couldn't have existed
you couldn't have existed
they couldn't have existed

V-ing perfect

I couldn't have been existing
you couldn't have been existing
she couldn't have been existing
we couldn't have been existing
you couldn't have been existing
they couldn't have been existing

Interrogative form

Simple form

could I exist?
could you exist?
could she exist?
could we exist?
could you exist?
could they exist?

V-ing form

could I be existing?
could you be existing?
could she be existing?
could we be existing?
could you be existing?
could they be existing?

Perfect

could I have existed?
could you have existed?
could she have existed?
could we have existed?
could you have existed?
could they have existed?

V-ing perfect

could I have been existing?
could you have been existing?
could she have been existing?
could we have been existing?
could you have been existing?
could they have been existing?

Interro-negative form

Simple form

couldn't I exist?
couldn't you exist?
couldn't she exist?
couldn't we exist?
couldn't you exist?
couldn't they exist?

V-ing form

couldn't I be existing?
couldn't you be existing?
couldn't she be existing?
couldn't we be existing?
couldn't you be existing?
couldn't they be existing?

Perfect

couldn't I have existed?
couldn't you have existed?
couldn't she have existed?
couldn't we have existed?
couldn't you have existed?
couldn't they have existed?

V-ing perfect

couldn't I have been existing?
couldn't you have been existing?
couldn't she have been existing?
couldn't we have been existing?
couldn't you have been existing?
couldn't they have been existing?

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