我经常去爬山英语

I often climbing mountain on weekend.

I often go to the park to climb the mountain

He often climbs the hill at the weekend.绝对没错的，我就是刚学的，这是一般现在时，爬山应该是climb the hill，第三人称一般现在时要加s. at the weekend和on weekdays是固定搭配。

He often climes a moutain on the weekend.相信我，没错的

I always climb mountains in the park.

I often go to the park to climb the hill