1）some time是名词短语，它的意思是“一段时间”。
She's been ailing for some time.
她身体不适已有一段时间了
It took me some time to digest what I had heard.
我花了一些时间才把听到的东西弄明白。 

2）sometime是副词，意思是“在某个时候”。可用于一般过去时与将来时。
Let's get together sometime.
有时间我们聚一下吧。 
I want to look them up sometime.
我希望能去拜访他们。 

3）sometimes的意思是“有时”，是副词。
Love is sometimes put in range with a career.
人们往往认为爱情和事业是并驾齐驱的。 
Sometimes the patient cried for the pain.
有时这个病人疼得哭起来。 

4）some times也是一个名词短语，time在这里用作可数名词，意思是“次数”。 
some times的意思是“几次”。 
I have been to the Great Wall some times. 
我去过长城几次