English verb conjugation
CAN WARN WARN

Regular verb: warn warn - warn warned - warn warned

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I can warn warn you can warn warn he can warn warn we can warn warn you can warn warn they can warn warn	I can be warn warning you can be warn warning he can be warn warning we can be warn warning you can be warn warning they can be warn warning
Perfect	V-ing perfect
I can have warn warned you can have warn warned he can have warn warned we can have warn warned you can have warn warned they can have warn warned	I can have been warn warning you can have been warn warning he can have been warn warning we can have been warn warning you can have been warn warning they can have been warn warning

Negation

Simple form	V-ing form
I cannot warn warn you cannot warn warn he cannot warn warn we cannot warn warn you cannot warn warn they cannot warn warn	I cannot be warn warning you cannot be warn warning he cannot be warn warning we cannot be warn warning you cannot be warn warning they cannot be warn warning
Perfect	V-ing perfect
I cannot have warn warned you cannot have warn warned he cannot have warn warned we cannot have warn warned you cannot have warn warned they cannot have warn warned	I cannot have been warn warning you cannot have been warn warning he cannot have been warn warning we cannot have been warn warning you cannot have been warn warning they cannot have been warn warning

Interrogative form

Simple form	V-ing form
can I warn warn? can you warn warn? can he warn warn? can we warn warn? can you warn warn? can they warn warn?	can I be warn warning? can you be warn warning? can he be warn warning? can we be warn warning? can you be warn warning? can they be warn warning?
Perfect	V-ing perfect
can I have warn warned? can you have warn warned? can he have warn warned? can we have warn warned? can you have warn warned? can they have warn warned?	can I have been warn warning? can you have been warn warning? can he have been warn warning? can we have been warn warning? can you have been warn warning? can they have been warn warning?

Interro-negative form

Simple form	V-ing form
can I not warn warn? can you not warn warn? can he not warn warn? can we not warn warn? can you not warn warn? can they not warn warn?	can I not be warn warning? can you not be warn warning? can he not be warn warning? can we not be warn warning? can you not be warn warning? can they not be warn warning?
Perfect	V-ing perfect
can I not have warn warned? can you not have warn warned? can he not have warn warned? can we not have warn warned? can you not have warn warned? can they not have warn warned?	can I not have been warn warning? can you not have been warn warning? can he not have been warn warning? can we not have been warn warning? can you not have been warn warning? can they not have been warn warning?