yesterday

昨天

She called me yesterday to ask about the meeting.

她昨天打电话来问会议的事。

不久前、前不久

I only found out about the change yesterday.

我也是前不久才知道有这项变动。

昨天、昨日

Yesterday was the hottest day of the year so far.

昨天是今年到目前为止最热的一天。

过去、往昔文学用法

He still lives in the yesterdays of his youth.

他至今仍活在年少时的旧日时光里。