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を見るべきだったのに

should have watched, but...

→ を
phrase Rare #36,079
should have watched, but... Often expresses regret, disappointment, or reproach. The object being watched comes before を in Japanese.
JA: あの映画を見るべきだったのに。
EN: I should have watched that movie.

あなたは昨晩あの映画を見るべきだったのに。

You should have watched that movie last night.

そのテレビ番組を見るべきだったのに。

You should have watched that TV show.

あなたはその絵を見るべきだったのに。

You should have seen that painting.

そのテレビを見るべきだったのに。

You should have watched that TV show.

君はその展覧会を見るべきだったのに。

You should have seen that exhibition.