2 sentences

1. 试图逃跑是没有用的。

   shì​tú táo​pǎo shì méi​yǒu​yòng de.

   It is no use trying to escape.

   Source: Tatoeba

2. 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