昨天我不在家用英文怎么说

"I wasn't at home yesterday."

"I wasn't" 是过去时的否定形式，表示过去某个时间不在某地。 "at home" 表示在家。

例句：

I wasn't at home when you called. (你打电话的时候我不在家。)
She said she wasn't at home last night. (她说昨晚她不在家。)
We weren't at home when the depvery came. (当送货来的时候我们不在家。)