He knows the rules because he has been there(some times/sometime/sometimes)选some times 为什么?这三个词有什么区别?

问题描述:

He knows the rules because he has been there(some times/sometime/sometimes)
选some times 为什么?这三个词有什么区别?

some time 一段时间
sometime 某个时间
some times 几次
sometimes 有时
翻译:他知道规则,因为他去过那几次.