4 sentences

1. 你再怎么解释也没用。

   nǐ zài zěn​me jiě​shì yě méi​yòng.

   No matter how you explain it, it's no use.

   Source: Dong Chinese Dictionary

2. 事已至此，你再怎么自责也于事无补。

   shì yǐ zhì cǐ, nǐ zài zěn​me zì​zé yě yú​shì​wú​bǔ.

   Now that things have come to this, no amount of self-blame will help.

   Source: Dong Chinese Dictionary

3. 真相早已大白，你现在再怎么解释也没有用了。

   zhēn​xiàng zǎo yǐ dà​bái, nǐ xiàn​zài zài zěn​me jiě​shì yě méi​yǒu​yòng le.

   The truth has long since come to light; no matter how you explain it now, it's of no use.

   Source: Dong Chinese Dictionary

4. 既然手机已经坏得没法修了，你再怎么后悔也没用。

   jì​rán shǒu​jī yǐ​jīng huài de méi​fǎ xiū le, nǐ zài zěn​me hòu​huǐ yě méi​yòng.

   Since the phone is broken beyond repair, there is no point in regretting it now.

   Source: Dong Chinese Dictionary