4 sentences

1. 和你争论是徒劳的。

   hé nǐ zhēng​lùn shì tú​láo de.

   Arguing with you is futile.

   Source: CCMatrix

2. 他现在做的一切都是徒劳的。

   tā xiàn​zài zuò de yī​qiè dōu shì tú​láo de.

   Everything that he is doing right now is in vain.

   Source: CCMatrix

3. 否则，你所有的努力都将是徒劳的。

   fǒu​zé, nǐ suǒ​yǒu de nǔ​lì dōu jiāng shì tú​láo de.

   Otherwise, all your efforts will be in vain.

   Source: CCMatrix

4. 永远不要让任何人羞辱你使你沉默、或让你相信你的努力是徒劳的。

   yǒng​yuǎn bù​yào ràng rèn​hé​rén xiū​rǔ nǐ shǐ nǐ chén​mò, huò ràng nǐ xiāng​xìn nǐ de nǔ​lì shì tú​láo de.

   Never let anyone shame you into silence or make you believe that your efforts are in vain.

   Source: CCMatrix