ingrid70 wrote:I agree with you that you're expected to use 'ad' + acc here; I checked the book, and 'in' + acc is introduced in paragraph 209.
ingrid70 wrote:However, as castrum is neuter, the acc.plu ends in -a, as does the nom.plu: ad castra Romana.
§ 53 tells you that ad takes the accusative of the noun it modifies.
Castrum is a neuter noun and means camp only when used in the plural.
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