The Double Shewa Rule
Although the purpose of this blog is to discuss aspects of composing in biblical Hebrew that you probably won't find in grammar books, this post is a little exception because this is a rule that's easy to miss when writing, especially when it comes to the interrogative ה for yes-no questions. The rule: you cannot have two shewa vowels together at the beginning of a word. You may have two shewas together in the middle of a word ( אִשְׁתְּךָ ), and occasionally the end of a word ( וַיֵּבְךְּ, הָלַכְתְּ ), but not the beginning. This rule is the reason we see changes like the following, to break up the initial cluster of shewas and/or hatef (half) vowels: vav conj. before shewa becomes וּ וְ + לְאַבְרָם = וְלְאַבְרָם ← וּ לְאַבְרָם vav conj. before yod+shewa becomes וִ וְ + יְהוּדָה = וְיְהוּדָה ← וִ יהוּדָה vav conjunction & prepositions ב,כ,ל before hatef vowel copy following vowel וְ + אֲנִי = וְאֲנִי ← וַ אֲנִי בְּ + אֱמֶת = בְּאֱמֶת ← בֶּ אֱמֶת