English verb conjugation COULD WARN

Regular verb: warn - warned - warned

Affirmation

Simple form

I could warn
you could warn
she could warn
we could warn
you could warn
they could warn

V-ing form

I could be warning
you could be warning
she could be warning
we could be warning
you could be warning
they could be warning

Perfect

I could have warned
you could have warned
she could have warned
we could have warned
you could have warned
they could have warned

V-ing perfect

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

Negation

Simple form

I could not warn
you could not warn
she could not warn
we could not warn
you could not warn
they could not warn

V-ing form

I could not be warning
you could not be warning
she could not be warning
we could not be warning
you could not be warning
they could not be warning

Perfect

I could not have warned
you could not have warned
she could not have warned
we could not have warned
you could not have warned
they could not have warned

V-ing perfect

I could not have been warning
you could not have been warning
she could not have been warning
we could not have been warning
you could not have been warning
they could not have been warning

Interrogative form

Simple form

could I warn?
could you warn?
could she warn?
could we warn?
could you warn?
could they warn?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not warn?
could you not warn?
could she not warn?
could we not warn?
could you not warn?
could they not warn?

V-ing form

could I not be warning?
could you not be warning?
could she not be warning?
could we not be warning?
could you not be warning?
could they not be warning?

Perfect

could I not have warned?
could you not have warned?
could she not have warned?
could we not have warned?
could you not have warned?
could they not have warned?

V-ing perfect

could I not have been warning?
could you not have been warning?
could she not have been warning?
could we not have been warning?
could you not have been warning?
could they not have been warning?

Page top