自己

In a sentence

• 你应该相信自己。

  You should believe in yourself.

  In this sentence, '自己' refers to the self as the object of belief, emphasizing self-confidence.

• 他一个人住在外地，什么事情都要自己做。

  He lives alone away from home, so he has to do everything by himself.

  Here, '自己' demonstrates the idea of doing things independently, without assistance from others.

• 我自己觉得这个主意不错。

  I personally think this idea is good.

  In this case, '自己' is used to stress the speaker's own opinion, adding emphasis to personal perspective.