靠自己用英文怎么表达？

英文是：by oneself、
短语：
all by oneself 独立 ; 全靠自己 ; 单独 ; 独自
in a class by oneself 独一无二 ; 唯一无二 ; 并世无双 ; 举世无双
live by oneself 独居 ; 茕居

例句：

Having the ability to solve problems by oneself reflects that the person is independent and has already grown up、

具有独立解决问题的能力，反映出一个人已经独立，已经长大了。

One is firmly established by oneself、

卓然自立。

One cannot live by oneself、

人不能单独生活。