3 sentences

1. 他在乐队里负责打鼓。

   tā zài yuè​duì lǐ fù​zé dǎ​gǔ.

   He plays the drums in the band.

   Source: Dong Chinese Dictionary

2. 他在交响乐团中负责打击乐器。

   tā zài jiāo​xiǎng​yuè​tuán zhōng fù​zé dǎ​jī​yuè​qì.

   He is in charge of percussion instruments in the symphony orchestra.

   Source: Dong Chinese Dictionary

3. 这周由我值日，放学后要负责打扫教室卫生。

   zhè zhōu yóu wǒ zhí rì, fàng​xué hòu yào fù​zé dǎ​sǎo jiào​shì wèi​shēng.

   It is my turn to be on duty this week, and I am responsible for cleaning the classroom after school.

   Source: Dong Chinese Dictionary