by oneself 单独,独力He is learning English by himself. 他正在自学英语for oneself 独自地,靠自己的力量 I must check for myself. 我一定要亲眼看见才能相信请及时采纳,不懂继续问( 天天在线 )(*^__^*) 祝学习进步! 谢谢!
I did the homework by myself. 作业是我自己做的。I bought a book for myself. 我为我自己买了一本书。