3 sentences for 口气 (kǒu​qì — tone of voice)

1. 你说话的口气就像爸妈。

   nǐ shuō​huà de kǒu​qì jiù xiàng bà mā.

   You sound like Mom and Dad.

   Source: OpenSubtitles

2. 他说话的口气俨然是个大人。

   tā shuō​huà de kǒu​qì yǎn​rán shì gè dà​ren.

   He spoke in the tone of an adult.

   Source: Dong Chinese Dictionary

3. 他年纪不大，说话的口气俨然是个大人。

   tā nián​jì bù dà, shuō​huà de kǒu​qì yǎn​rán shì gè dà​ren.

   He is quite young, but he talks just like an adult.

   Source: Dong Chinese Dictionary