Some time means a period of time.

Some time表示一段时间。

Example 1: The government still has sufficient instruments and still some time to move on this question.

例1：政府仍然有足够的工具和时间来应对这个问题。

Example 2: I think Jenny and I need some time right now anyway.

例2：反正我和珍妮需要一点时间。

Sometime indicates a time in the future or the past which is not known or not stated.

Sometime表示δ来或者过去的某个时间，而这个时间目前还δ知或者û有表述清楚。

Example 1: They hoped to meet up sometime.

例1：他们希望能找个时间见个面。

Example 2: The sales figures won't be released until sometime next month.

例2：销售数据要到下个月的某个时候才会公布。

Sometimes means on some occasions but not always or often.

Sometimes指的是有时，但并不经常，表示频率。

Example 1: During the summer, my skin sometimes gets greasy.

例1：夏天我的皮肤有时会变得爱出油。

Example 2: I differed with my partner sometimes,but we usually agree.

例2：我有时与我的伙伴争论，但我们通常是一致的。
 

一段时间、某时和有时的辨析，希望对大家有帮助。