This isn't my pencil.
這不是我的鉛筆。
Is this your pencil?
這是你的鉛筆嗎?
No, it isn't.
不,不是。
Is that your pencil?
那是你的鉛筆嗎?
No, it isn't.
不,不是。
Oh, that's my pencil.
哦,那是我的鉛筆。
Is that a pencil?
那是鉛筆嗎?
Yes, it is. It's a pencil.
是的。是鉛筆。