届时

dà qiáo xià gè yuè jùn gōng jiè shí jiāng jǔ xíng tōng chē diǎn lǐ

大桥下个月竣工，届时将举行通车典礼。

There will be an opening ceremony next month when the bridge is completed.

jiè shí qǐng wù bì chū xí

届时请务必出席。

Your presence is requested for the occasion.

jiè shí gāi wèn tí yǒu wàng dé dào jiě jué

届时，该问题有望得到解决。

By then the problem will hopefully have been solved.

jiǎng shī jiè shí huì zhǐ zhèng nǐ de cuò wù

讲师届时会指正你的错误。

The instructors will then point out your mistakes.