你nǐ自zì己jǐ去qù吧ba，我wǒ有yǒu事shì。

Go by yourself, I have something to do.

她tā什shén么me事shì都dōu自zì己jǐ做zuò。

She does everything herself.

你nǐ要yào对duì自zì己jǐ有yǒu信xìn心xīn。

You need to have confidence in yourself.

我wǒ自zì己jǐ来lái做zuò饭fàn。

I will cook for myself.

他tā只zhī关guān心xīn自zì己jǐ。

He only cares about himself.