The pi’el infinitive construct for most roots has the pattern patakh-tseirei: דַּבֵּר. Its distinctive patakh-tseirei vowel combination can be heard throughout the other conjugations. As in other binyanim, when the final root letter is ה, that ה strengthens to a ת and the vowel is kholam: צַוּוֹת. When a prepositional prefix is added to a pi’el infinitive, its vowel is a sh’va: לְדַבֵּר.