by oneself 和 on one's own 的意思相同，都是“ 独自， 单独” 的意思；
1、by oneself 自行；单独，独力；孑然一身；各自 ；强调亲自,没有别人帮助
One is firmly established by oneself. 卓然自立。
2、on one's own 靠自己的力量，独自地，主动地，靠自己自食其力；
Success in study mainly depends on one's own efforts. 学习主要靠自己努力。
3、一般可以互换且放在句末。
by oneself 中的oneself 是反身代词 ； on one's own 中的 one's 是用形容词性物主代词。
如：
He can finish the work by himself .= He can finish the work on his own.
他可以自己完成这项工作。
Lucy often goes to school by herself .= Lucy often goes to school on her own .
露丝经常独自上学。
扩展资料
1、The infirmity that felling is so by oneself with need to be depended on!
感觉自己是那么的虚弱和需要依靠！
2、It's more satisfying to do the job by oneself.
独自一人做这项工作更让人感到满足。
3、Don't be silly, you must depend on one's own.
别太傻了，你要靠自己。
4、Most of the shadows of this life are caused by standing on one's own sunshine.
我们一生中大多数的阴影是因我们自己的阳光所造成的。