According to the Radak (Rabbi David Kimhi), verbs with four letters, likeבונן קומם שובב, are pronounced with a צירי (long-a sound, as in “pay”) when they come without a repeated letter, and are pronounced with a פתח (short-a sound, as in “cat”) when they come with a repeated letter. And this is the opinion of Rabbi Elia Levita. And according to Rabbi Abraham ben Meir Ibn Ezra, regardless of whether they come with or without a repeated letter, the פתח and צירי are distinguished between active and passive intensive conjugation in that when they are in active intensive conjugation, they both will have a צירי, and when they are in passive intensive conjugation, they both will have a פתח.

And just as the Medieval commentators disagree about this, there is a similar disagreement between the sages of the Talmud about the verb תעוננו, whether its root is עון or עונן.