3 sentences

1. 不可能，他在吹牛，他是个疯子。

   bù kě​néng, tā zài chuī​niú, tā shì gè fēng​zi.

   Impossible, he's bragging, he's a lunatic.

   Source: OpenSubtitles

2. 他经常向朋友吹牛，说自己能徒手抓住老虎。

   tā jīng​cháng xiàng péng​you chuī​niú, shuō zì​jǐ néng tú​shǒu zhuā​zhù lǎo​hǔ.

   He often brags to his friends that he can catch a tiger with his bare hands.

   Source: Dong Chinese Dictionary

3. 晚饭后，老人们聚在村口的大树下吹牛。

   wǎn​fàn hòu, lǎo​rén​men jù zài cūn​kǒu de dà​shù xià chuī​niú.

   After dinner, the elderly people gather under the big tree at the entrance of the village to chat.

   Source: Dong Chinese Dictionary