Learn what "i don't know why she's not on time" means, when people say it, and how to use it naturally in English.

It means the speaker does not know the reason for someone's lateness.
From I Think My Wife Wants To Kill Me, Episode 59
The speaker says they do not know why a woman has not arrived on time.
Use this when discussing a delay or someone's late arrival. It is neutral and common, but it can sound a little critical if said with a bad tone.
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