3 sentences

1. 我并没有自相矛盾。

   wǒ bìng méi​yǒu zì​xiāng​máo​dùn.

   I'm not contradicting myself.

   Source: AI Challenger 2017

2. 你总是自相矛盾。

   nǐ zǒng​shì zì​xiāng​máo​dùn.

   You are always contradicting yourself.

   Source: CCMatrix

3. 你在自相矛盾。

   nǐ zài zì​xiāng​máo​dùn.

   You're contradicting yourself.

   Source: Tatoeba