2 sentences

1. 他在婚礼前夜紧张得整晚没睡。

   tā zài hūn​lǐ qián​yè jǐn​zhāng de zhěng wǎn méi shuì.

   He was so nervous on the eve of his wedding that he didn't sleep all night.

   Source: Dong Chinese Dictionary

2. 该国当时正处于社会大变革的前夜。

   gāi guó dāng​shí zhèng chǔ​yú shè​huì dà biàn​gé de qián​yè.

   The country was then on the eve of a great social transformation.

   Source: Dong Chinese Dictionary