Usages of kokuban
黒板 が 汚れたら、 消しゴム で 消せば きれい に なる。kokuban ga yogoretara, kesigomu de keseba kirei ni naru.
If the blackboard gets dirty, erasing it with an eraser makes it clean.
学生 は 黒板 を 見ます。gakusei ha kokuban wo mimasu.
Students look at the blackboard.
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