5 sentences

1. 哼，你以为我真的会上当吗？

   hng, nǐ yǐ​wéi wǒ zhēn​de huì shàng​dàng ma?

   Humph, do you think I'll really fall for it?

   Source: Dong Chinese Dictionary

2. 他过了很久才发觉自己上当了。

   tā guò le hěn jiǔ cái fā​jué zì​jǐ shàng​dàng le.

   It took him a long time to realize he had been deceived.

   Source: Dong Chinese Dictionary

3. 这一招数果然奏效，对方上当了。

   zhè yī zhāo​shù guǒ​rán zòu​xiào, duì​fāng shàng​dàng le.

   This tactic worked as expected, and the opponent fell for it.

   Source: Dong Chinese Dictionary

4. 别轻易相信这些小广告，小心上当受骗。

   bié qīng​yì xiāng​xìn zhè​xiē xiǎo guǎng​gào, xiǎo​xīn shàng​dàng shòu​piàn.

   Don't believe these small advertisements easily; be careful not to get scammed.

   Source: Dong Chinese Dictionary

5. 这种低劣的骗术完全是为了惑人，大家千万别上当。

   zhè zhǒng dī​liè de piàn​shù wán​quán shì wèi​le huò​rén, dà​jiā qiān​wàn bié shàng​dàng.

   This crude trick is purely meant to deceive; don't be fooled by it.

   Source: Dong Chinese Dictionary