“他常在周末与朋友相约一起去爬山”用英语怎么翻译

这句话翻译成英文应该是：He often goes hiking with his friends on weekends. 这里把爬山用 hiking 表达比较地道，also 用 on weekends 表示在周末。

英文翻译为：He often goes mountain climbing with his friends on weekends. 这个表达也很常用，重点在于 go mountain climbing 这个固定搭配。

对应的英文翻译是：He usually climbs mountains with his friends on weekends. 注意主语是第三人称单数，所以动词 climb 要加 s，变成 climbs。