你nǐ什shén么me时shí候hòu回huí来lái？我wǒ们men在zài等děng你nǐ。

When will you come back? We are waiting for you.

请qǐng问wèn会huì议yì什shén么me时shí候hòu开kāi始shǐ？

May I ask when the meeting starts?

你nǐ什shén么me时shí候hòu到dào的de家jiā？

When did you get home?

我wǒ们men什shén么me时shí候hòu出chū发fā？

When are we setting off?

她tā什shén么me时shí候hòu结jié婚hūn还hái没méi决jué定dìng。

She has not yet decided when to marry.