"我在外面（出門玩、辦事）”不說outside

In English, outside either(當(dāng)然） means to be external to or near a room, building or place.在房間、建筑或某個地方的外面或附近

outside正確用法:

I'm coming.I'll just wait for u outside./Let's eat outside(在室外吃飯：比如picnic/eat in the restaurant's outdoor space)

下館子：eat out (Let's~tonight.)

出門玩、辦事：用out:

She's ~with her friends.

They're ~working.

He's ~partying.