4 sentences for 剛 (gāng — hard)

1. 太极拳讲究以柔克刚。

   tài​jí​quán jiǎng​jiu yǐ róu kè gāng.

   Tai Chi emphasizes overcoming hardness with softness.

   Source: Dong Chinese Dictionary

2. 他的性格外柔内刚，非常有主见。

   tā de xìng​gé wài róu nèi gāng, fēi​cháng yǒu zhǔ​jiàn.

   He is gentle on the outside but firm on the inside, with a very strong mind of his own.

   Source: Dong Chinese Dictionary

3. 他的性格刚烈，绝不向恶势力低头。

   tā de xìng​gé gāng liè, jué bù xiàng è shì​li dī​tóu.

   He has an unyielding character and will never bow to evil forces.

   Source: Dong Chinese Dictionary

4. 中国文化讲究平衡，有阴必有阳，有刚必有柔。

   Zhōng​guó wén​huà jiǎng​jiu píng​héng, yǒu yīn bì yǒu yáng, yǒu gāng bì yǒu róu.

   Chinese culture emphasizes balance: where there is yin, there must be yang; where there is hardness, there must be softness.

   Source: Dong Chinese Dictionary