Inf. Construct - Bib. Hebrew?

Both are statements are sort of true, but not quite. The construct infinitive (which is a very misleading name for it) usually has one of these prepositions, most commonly L-, but not always. And often looks like the imperative, but not always. F.ex., she:bh 'sit!' but (la:)-shebheth 'to sit'. If you need any more details or help, plz ask.