2 sentences

1. 你为什么不告诫他？

   nǐ wèi​shén​me bù gào​jiè tā?

   Why didn't you warn him?

   Source: AI Challenger 2017

2. 那位老人告诫那些孩子不要在这么薄的冰上溜冰。

   nà wèi lǎo​rén gào​jiè nà​xiē hái​zi bù​yào zài zhè​me báo de bīng shang liū bīng.

   The old man warned the children not to skate on such thin ice.

   Source: UM-Corpus: News