What is incorrectly structured in 'Necesse est nōbīs intrā cubiculō manēre'?

In the phrase "Necesse est nōbīs intrā cubiculō manēre," the first point relates to the preposition "intrā." This term indeed requires its object to be in the accusative case; however, in this particular construction, where it is accompanied by "cubiculō" (which is in the ablative case), it signals a potential discrepancy in case usage.

To clarify, "intrā" is a preposition that takes the accusative case to indicate movement into a space, meaning it should be correctly paired with a noun in this case. Therefore, the phrase might be viewed as incorrectly structured because "cubiculō" is not in the expected accusative form but rather in the ablative, indicating location instead of direction.

The other options do not highlight errors in this sentence structure. The spelling of "Necesse" is appropriate as per Latin norms, and "nōbīs" is indeed in the dative case to indicate the indirect object rather than the nominative case used for subjects. The suggestion to replace "intrā" with "sub" alters the original meaning potentially, as "sub" implies being under rather than entering, which changes the intended action of remaining inside. Thus, the