Biblical Hebrew has a distinction between past and future tenses which is similar in form to those used in other Semitic languages such as Arabic and Aramaic. Gesenius refers to the past and future verb forms as Perfect and Imperfect, respectively, separating completed action from uncompleted action. However, the usage of verbs in these forms does not always have the same temporal meaning as in Indo-European languages, mainly due to the common use of a construct of inverting the time reference with a prefix "Waw consecutive" (ו' ההיפוך). With this construct, the Perfect-consecutive refers to the future and the Imperfect-consecutive refers to the past.