by oneself

单独, 独自

by oneself, for oneself, in oneself, of oneself

这些词组都包含oneself这个单词。
by oneself: 意思是“单独地”、“靠自己地”（alone or independently）。

• his father lives by himself in the village.
  他的父亲独自一个人住在村里。
• all his friends have deserted him and he is all by himself now.
  他所有的朋友都离弃他，现在他孤独一人。

for oneself: 意义为“为自己”（for himself or for herself）。

• one should not live only for oneself.
  人不应单为自己而活。

in oneself: 意思是“就其本身或本性而言”。

• this wood is hard in itself.
  这种木头本要就是硬的。

of oneself: 意思是“自然地”、“自发地”、“自动地”（of one's own accord）。

• every day i awake of myself at half past five.
  每天早上我都是五点半就自己醒来。
• the door opened of itself.
  门是自己开的。
• the fire went out of itself.
  火自己熄灭了。