In Latin, nouns of the second declension, like "cubiculum," have the same form in the nominative and accusative singular.
Here's a breakdown:
* Nominative singular: cubiculum (the subject of a sentence)
* Accusative singular: cubiculum (the direct object of a verb)
For example:
* Nominative: *Cubiculum* est magnum. (The bedroom is big.)
* Accusative: Video *cubiculum*. (I see the bedroom.)