Learn what "when you were" means, when people say it, and how to use it naturally in English.

It means the speaker is describing a visual observation, usually with concern.
From The Perfect Husband, Episode 20
He is saying he noticed the other person looked pale when they arrived.
Use it when commenting on someone's appearance in a health-related context. It can sound caring, but also awkward if said too directly.
Scenes unlock real expressions as you watch
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