在 zài to exist; to be alive(of sb or sth) to be (located) at(used before a verb to indicate an action in progress) Example sentences 你要待在房间里面多久？ nǐ yào dāi zài fángjiān lǐmiàn duōjiǔ? How long are you going to stay in the room? 我有时候会待在图书馆里看书。 wǒ yǒu shíhou huì dāi zài túshūguǎn lǐ kànshū. Sometimes I will stay in the library and read books