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 cannot warn
you cannot warn
he cannot warn
we cannot warn
you cannot warn
they cannot warn

V-ing form

I cannot be warning
you cannot be warning
he cannot be warning
we cannot be warning
you cannot be warning
they cannot be warning

Perfect

I cannot have warned
you cannot have warned
he cannot have warned
we cannot have warned
you cannot have warned
they cannot have warned

V-ing perfect

I cannot have been warning
you cannot have been warning
he cannot have been warning
we cannot have been warning
you cannot have been warning
they cannot 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 I not warn?
can you not warn?
can he not warn?
can we not warn?
can you not warn?
can they not warn?

V-ing form

can I not be warning?
can you not be warning?
can he not be warning?
can we not be warning?
can you not be warning?
can they not be warning?

Perfect

can I not have warned?
can you not have warned?
can he not have warned?
can we not have warned?
can you not have warned?
can they not have warned?

V-ing perfect

can I not have been warning?
can you not have been warning?
can he not have been warning?
can we not have been warning?
can you not have been warning?
can they not have been warning?

Page top