English verb conjugation COULD WARN

Regular verb: warn - warned - warned

Affirmation

Simple form

I could warn
you could warn
he could warn
we could warn
you could warn
they could warn

V-ing form

I could be warning
you could be warning
he could be warning
we could be warning
you could be warning
they could be warning

Perfect

I could have warned
you could have warned
he 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
he could have been warning
we could have been warning
you could have been warning
they could have been warning

Negation

Simple form

I couldn't warn
you couldn't warn
he couldn't warn
we couldn't warn
you couldn't warn
they couldn't warn

V-ing form

I couldn't be warning
you couldn't be warning
he couldn't be warning
we couldn't be warning
you couldn't be warning
they couldn't be warning

Perfect

I couldn't have warned
you couldn't have warned
he couldn't have warned
we couldn't have warned
you couldn't have warned
they couldn't have warned

V-ing perfect

I couldn't have been warning
you couldn't have been warning
he couldn't have been warning
we couldn't have been warning
you couldn't have been warning
they couldn't have been warning

Interrogative form

Simple form

could I warn?
could you warn?
could he warn?
could we warn?
could you warn?
could they warn?

V-ing form

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

Perfect

could I have warned?
could you have warned?
could he 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 he have been warning?
could we have been warning?
could you have been warning?
could they have been warning?

Interro-negative form

Simple form

couldn't I warn?
couldn't you warn?
couldn't he warn?
couldn't we warn?
couldn't you warn?
couldn't they warn?

V-ing form

couldn't I be warning?
couldn't you be warning?
couldn't he be warning?
couldn't we be warning?
couldn't you be warning?
couldn't they be warning?

Perfect

couldn't I have warned?
couldn't you have warned?
couldn't he have warned?
couldn't we have warned?
couldn't you have warned?
couldn't they have warned?

V-ing perfect

couldn't I have been warning?
couldn't you have been warning?
couldn't he have been warning?
couldn't we have been warning?
couldn't you have been warning?
couldn't they have been warning?

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