你别浪费时间做这些没用的事情。

Nǐ bié làngfèi shíjiān zuò zhèxiē méiyòng de shìqing.

Don’t waste time doing these useless things.

一直抱怨是没用的，你得想办法解决问题。

Yìzhí bàoyuàn shì méi yòng de, nǐ děi xiǎng bànfǎ jiějué wèntí.

Constantly complaining is useless; you have to think of a way to solve the problem.

光说不做是没用的，你要行动。

Guāng shuō bù zuò shì méiyòng de, nǐ yào xíngdòng.

Just talking without doing is useless; you need to take action.