3 sentences

1. 他总是故意跟我作对。

   tā zǒng​shì gù​yì gēn wǒ zuò​duì.

   He is always deliberately going against me.

   Source: Dong Chinese Dictionary

2. 你是在跟老师作对吗？

   nǐ shì zài gēn lǎo​shī zuò​duì ma?

   Are you going against your teacher?

   Source: OpenSubtitles

3. 这两句诗正好可以作对。

   zhè liǎng jù shī zhèng​hǎo kě​yǐ zuò​duì.

   These two lines of poetry happen to form a perfect couplet.

   Source: Dong Chinese Dictionary