This isn't my pencil.
这不是我的铅笔。
Is this your pencil?
这是你的铅笔吗?
No, it isn't.
不,不是。
Is that your pencil?
那是你的铅笔吗?
No, it isn't.
不,不是。
Oh, that's my pencil.
哦,那是我的铅笔。
Is that a pencil?
那是铅笔吗?
Yes, it is. It's a pencil.
是的。是铅笔。