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同学你好。

1 sometime,some time与sometimes三个都可以表示时间。它们看起来没多大区别，但用法却各不相同。
sometimes用作副词，表示“有的时候”，与from time to time 意思相同，可以把它放在句首，句尾或句中。sometimes是频率副词，它暗指某动作（在过去、现在或将来）有时候重复。如：
Last year she went to the park sometimes.
Sometimes I get up at six.
I sometimes think you are wrong.
2 sometime 用作副词。表示某个不确切或不具体的时间，表示“某个时候”，它后面应该接一个过去或将来的时间。例如：
Tom went back home sometime last month.
We will have a meeting sometime next week.(sometime last year,sometime next month等常修饰非延续性的谓语)
另外，sometime还可以用作形容词，表示“以前的”，如：
A sometime student of yours is waiting for you at the gate.
3 some time 表示一些时间或“一段时间”，可以用作名词或副词短语。例如：
She always spends some time on her English.
It took us some time to water the flowers.
some time表某一段时间时，常常修饰延续性的谓语。如：
She stayed in bed for some time.
I will work in Japan for some time.
4. some times 是名词词组，意为“几次，几倍”，如：
I met him some times in the street last month.
The factory is some times larger than that one.

希望有帮助到你~