1

我不知道

wǒbùzhīdào

I don't know.

2

谁

shéi

who also pr. shuí

=3

要

yāo

(bound form) to demand; to coerce

=3

要

yào

to want; to need; to ask for will; shall; about to need to; should if (same as 要是 yàoshi) (bound form) important

=3

要

yǎo

(archaic) alternative form of 偠 (yǎo) alternative form of 偠 (yǎo) used in 要褭／要袅

4

来

lái

to come (used as a substitute for a more specific verb) hither (directional complement for motion toward the speaker, as in 回来 huílai) ever since (as in 自古以来 zìgǔyǐlái) for the past (amount of time) (prefix) the coming ...; the next ... (as in 来世 láishì) (between two verbs) in order to (after a round number) approximately (used after 得 dé to indicate possibility, as in 谈得来 tándelái, or after 不 bù to indicate impossibility, as in 吃不来 chībulái)