That sounds awful to my en-gb ears. "They climbed some hill" sounds like a weird way to say "a little of a hill, but not the whole thing".
"They all climbed hills" or "Everyone climbed one of the hills" if people didn't climb more than one hill each.
That sounds awful to my en-gb ears. "They climbed some hill" sounds like a weird way to say "a little of a hill, but not the whole thing".
"They all climbed hills" or "Everyone climbed one of the hills" if people didn't climb more than one hill each.