2 sentences

1. 他意识到自己闯了大祸。

   tā yì​shí dào zì​jǐ chuǎng le dà​huò.

   He realized he had gotten into big trouble.

   Source: Dong Chinese Dictionary

2. 若不及时纠正，恐怕会酿出大祸。

   ruò bù jí​shí jiū​zhèng, kǒng​pà huì niàng chū dà​huò.

   If it's not corrected in time, it might lead to a major disaster.

   Source: Dong Chinese Dictionary