来年の春、退職される。

English Translation

He retires next spring.

Why is the verb in the causative form, される、instead of する?

@ericaw
される is not a causative passive form but a respectful form or 尊敬語. The “he” guy is in a honorable position or is senior to the speaker.

Here is a conversation table between some normal expressions and their respectful forms.

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