The correct term is open. It is an inflection of open. Then uncover, discover, start, break, tear, splitting, extending, folding, slitting.
Open or there will be incorrectly written and should be written as "Open" as meaning: Verb open. Third-person plural of the present indicative form: they, as open. With initial hache does not exist any verbal form of the verb HABER.
Open the verb open