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