HSK 3
Yīnwèi xiàyǔ, tāmen zhéhuí le yíngdì.
Because of the rain, they turned back to the campsite.
HSK 7-9
Zǒu le yībàn tā fāxiàn wàng le yàoshi, zhǐhǎo zhéhuí qù qǔ.
Halfway there he realized he had forgotten his keys and had to turn back to get them.
