ecce

Ecce is an interjection, not a verb, and it governs nothing. The noun after it normally stands in the nominative, as in ecce homo; the accusative appears in comedy, where ecce fuses with pronouns to give eccum, eccam, eccos, "here he is, here she is".

It carries an outsized load in this corpus because the Vulgate uses it to render the Hebrew hinneh, the particle that opens hundreds of verses. Which is a warning: translate every one of them as "behold" and you produce something no English speaker has said since 1611. Often "look", "and there", or simply nothing reads better. Italian ecco and French voici and voilà do the same job today, and English took ecce only in the frozen phrase ecce homo.