I once had a teacher who used to throw chalk at inattentive students and those very students then had to bring it back to him.
我曾經有一位老師曾經向注意力不集中的學生扔粉筆,而這些學生隨後不得不把它帶回來給他。
Bring me a piece of chalk.
給我拿一塊粉筆。
Please bring me two pieces of chalk.
請給我兩塊粉筆。