I have one ruler and he has one eraser.

　　我有一把尺，他有一塊橡皮。

　　I have a new eraser. It's a fish.

　　我有一塊新橡皮，它是魚。

　　Now where did my eraser go this time?

　　這回我的橡皮又到哪去了？

　　If you need to change what you wrote, just use this eraser.

　　如果你需要更改所寫的內容，就用這塊橡皮擦。

　　Pass me your eraser to make the board clean.

　　把你的擦子遞給我，我來把黑板擦干凈。