by oneself 与on one's own 有什么区别?感觉就是一样的!

第一个有通过的意思是借助自己或者别人来完成的，第二个是直接的靠什么什么的。

我感觉也没区别，但是by oneself 口语用得比较多后者书面语用的多。

没区别.但如果是一道给空格完成句子的题,一空一词的那种,那就两个空填by oneself,三个空on one's own...

by oneself （用作副词）
(1) 独自一人(= alone),例如：
She used to sit by herself and read.
她从前常常独自坐着看书。
(2) 独立地，单独地，自动地，如：
He finished it by himself.
他独立完成那件事。
on one's own - ①独立无助地②独立的；自主的。
例句如下：
(a) 独自: I'm all on my own today. 今天我是独自一人. * She liveson her own. 她独自过日子.
(b) 独力地; 单独地: He can be left to work on his own. 工作可交给他一个人去做. * Although her father is in the firm she got the job on her own. 尽管她父亲在公司里, 但她那份工作却是靠自己得到的.
(c) 出色的; 非凡的; 卓越的: When it comes to craftsmanship, Sally is on her own, ie is better than anyone. 说到手艺, 萨莉是独一无二的.