2 sentences for 老大 (lǎo​dà — very)

1. 费了老大劲，高低把这事办成了。

   fèi le lǎo​dà jìn, gāo​dī bǎ zhè shì bàn​chéng le.

   After a lot of effort, we finally managed to get it done.

   Source: Dong Chinese Dictionary

2. 听到这个消息，他心里老大不高兴。

   tīng​dào zhè​gè xiāo​xi, tā xīn​li lǎo​dà bù gāo​xìng.

   He was extremely unhappy when he heard the news.

   Source: Dong Chinese Dictionary