4 sentences

1. 他们两人挺谈得对头。

   tā​men liǎng rén tǐng tán de duì​tóu.

   The two of them really hit it off in conversation.

   Source: Dong Chinese Dictionary

2. 他们两家是几十年的老对头了。

   tā​men liǎng jiā shì jǐ​shí nián de lǎo duì​tou le.

   The two families have been old rivals for decades.

   Source: Dong Chinese Dictionary

3. 这道题的计算思路好像不太对头。

   zhè dào tí de jì​suàn sī​lù hǎo​xiàng bù tài duì​tóu.

   The logic for solving this problem doesn't seem quite right.

   Source: Dong Chinese Dictionary

4. 他们两家因为地界问题一直不对头，经常发生争执。

   tā​men liǎng jiā yīn​wèi dì​jiè wèn​tí yī​zhí bù duì​tou, jīng​cháng fā​shēng zhēng​zhí.

   The two families have been at odds over boundary issues for a long time and frequently get into disputes.

   Source: Dong Chinese Dictionary