英语中sometime、sometimes、some time、some times有什么区别?

英语中sometime、sometimes、some time、some times有什么区别?
速度啊````````
速度啊`````````````
速度````````````````````````````````````````````
速度

1. sometimes : 副词 adv. 不时；有时
not very often
* We sometimes visit our grandmother.
我们有时去看我们的祖母.
* Sometimes I wonder if he is honest.
有时我怀疑他是否诚实.
2.some time : 副词 adv. 在未来某时, 经过若干时间
* I will be back some time next week.
3.sometime : 副词 adv. 某个时候；某日
at a time that one does not know exactly
* I saw him sometime last year.
我去年某个时候见到过他.