英语中 sometimes、sometime、some time、some times的区别

英语中 sometimes、sometime、some time、some times的区别
最好能举出例子,

sometimes ad.有时,表示频率,是频率副词
=at times,有时,偶尔；every now and then不时地,常常
Sometimes I work in the day and sometimes at night.
我有时候在白天工作,有时候在晚上工作.
sometime ad.（过去或将来的）某一时刻
I hope to go to Beijing sometime soon.
我希望不久的将来能去北京.
some time 一段时间
It takes some time to cultivate some friendship.
建立新的友谊是需要一些时间的.
some times 好几次
My uncle has been to London some times.
我叔叔已经去伦敦好几次了.