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1·She runs the business by herself.

她自己经营这项生意。《牛津词典》

2·She got a seat by herself.

她自己找了个座位。

3·Molly was happy because she solved her problem all by herself!

莫莉很高兴，因为她自己解决了问题！

4·She did homework by herself.

她自己做的作业。

5·Let her choose by herself!

让她自己来选择吧！

6·It has always been my custom to get in a car first, and let the woman get in by herself.

我的习惯是先上车，再让女士自己上车。

7·Whenever she had problems, she would either solve them by herself or ask teachers for help.

每当她遇到问题，她要么自己解决，要么向老师寻求帮助。

8·Instead of giving her money to buy the toy, Taylor's father encouraged her to make money by herself.

泰勒的父亲没有给她钱去买玩具，而是鼓励她自己去赚钱。

9·Having one's own bedroom even as an infant, fixes in a person the notion that she is entitled to a place of her own where she can be by herself, and keep her possessions.

（美国人）甚至在婴儿时期就拥有自己的卧室，这会使人产生这样一种观念：她有权拥有一个属于她自己的地方，在那里她可以独处、可以保存她的物品。

10·She lives by herself.

她独自一人生活。《牛津词典》