7 sentences

1. ‎我何必跟你争辩呢？

   ‎ wǒ hé​bì gēn nǐ zhēng​biàn ne?

   Why am I even arguing with you?

   Source: OpenSubtitles

2. ‪何必把她吵醒呢？

   ‪ hé​bì bǎ tā chǎo​xǐng ne?

   Why wake her up?

   Source: OpenSubtitles

3. 我何必这么做？

   wǒ hé​bì zhè​me zuò?

   Why would I do that?

   Source: OpenSubtitles

4. 他何必撒谎？

   tā hé​bì sā​huǎng?

   Why would he lie?

   Source: OpenSubtitles

5. 我何必说谎？

   wǒ hé​bì shuō​huǎng?

   Why would I lie?

   Source: OpenSubtitles

6. 既然你已经知道了，何必再问我呢？

   jì​rán nǐ yǐ​jīng zhī​dào le, hé​bì zài wèn wǒ ne?

   Since you already know, why bother asking me again?

   Source: Dong Chinese Dictionary

7. 何必问呢？

   hé​bì wèn ne?

   Why even ask?

   Source: OpenSubtitles