我喜欢在周末爬山。
wǒ xǐhuān zài zhōumò páshān 。
I like to climb mountains on the weekends.
他们昨天去爬山了。
tāmen zuótiān qù páshān le 。
They went climbing yesterday.
爬山的时候一定要注意安全。
páshān de shíhòu yīdìng yàozhùyì ānquán 。
You must pay attention to safety when climbing mountains.