文不对题

nǐ de huí dá wén bù duì tí

你的回答文不对题。

Your answer is beside the point.

tā duì yuán yì de yī xí huà jiǎn zhí shì wén bù duì tí

他对园艺的一席话简直是文不对题。

His remarks about gardening were hardly to the purpose.

zhè piān zuò wén wén bù duì tí

这篇作文文不对题。

The essay isn't even remotely relevant to the topic.