Learn what "i wasn't sure when you would be up" means, when people say it, and how to use it naturally in English.

It means the speaker did not know when the other person would get up or be awake.
From The Billionaire’S Lost Love, Episode 7
Someone explains they did not know when the other person would wake up.
Use this in casual conversation when explaining why you waited or came by at that time. It is natural and common in spoken English.
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