2 sentences for 不该 (bù​gāi)

1. 你不该对他撒谎。

   nǐ bù​gāi duì tā sā​huǎng.

   You shouldn't have lied to him.

   Source: Dong Chinese Dictionary

2. 欠你的钱我都还清了，现在我不该你什么了。

   qiàn nǐ de qián wǒ dōu huán​qīng le, xiàn​zài wǒ bù​gāi nǐ shén​me le.

   I've paid you back in full; I don't owe you anything now.

   Source: Dong Chinese Dictionary