English verb conjugation CAN WARN

Regular verb: warn - warned - warned

Affirmation

Simple form

I can warn
you can warn
he can warn
we can warn
you can warn
they can warn

V-ing form

I can be warning
you can be warning
he can be warning
we can be warning
you can be warning
they can be warning

Perfect

I can have warned
you can have warned
he can have warned
we can have warned
you can have warned
they can have warned

V-ing perfect

I can have been warning
you can have been warning
he can have been warning
we can have been warning
you can have been warning
they can have been warning

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I warn?
can you warn?
can he warn?
can we warn?
can you warn?
can they warn?

V-ing form

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

Perfect

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

V-ing perfect

can I have been warning?
can you have been warning?
can he have been warning?
can we have been warning?
can you have been warning?
can they have been warning?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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