小报告

xiàng lǎo shī dǎ xiǎo bào gào

向老师打小报告

snitch to the teacher

nǐ yīng gāi rèn shi dào nǐ bù gāi dǎ tóng xué de xiǎo bào gào

你应该认识到你不该打同学的小报告。

You should learn that you just don’t tattle on classmates.