Tomorrow is my day off
明天我放假
I'm not working tomorrow.
明天我不工作
I have got the day off tomorrow.
明天放假休息
I'm off tomorrow.
明天我不工作
I'll have a day off tomorrow.
明天我放假

“他不在”用英语怎么说呢？
He's off duty today.
他今天不值班。
He is gone for the day.
他下班了。
He's no longer working here.
他离职了。
He's on a sick leave.
他在休病假。
He's out at the moment.
他现在外出。
He's not in the right now.
他现在不在。