tā / zhī / dào / zì / jǐ / fàn / le / cuò / biàn / qǐng / qiú / lǎo / shī / shǒu / xià / liú / qíng

他知道自己犯了错，便请求老师手下留情。

He knew he had made a mistake and asked the teacher to go easy on him.