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1·In 1989, Tim Berners Lee invented the World Wide Web all by himself.

1989年，蒂姆·伯纳斯·李发明了万维网，这完全是他自己发明的。

2·He was doing it all by himself.

全都是他独自一个人干的。《柯林斯英汉双解大词典》

3·He lives all by himself.

他独自一人生活。《牛津词典》

4·He managed to repair the car by himself.

他自己设法修了汽车。《牛津词典》

5·He walked a little by himself in the garden.

他在花园里独自散了会儿步。《柯林斯英汉双解大词典》

6·He had tried to detox twice by himself, but couldn't.

他曾两次试图自行脱瘾，但是没做到。《柯林斯英汉双解大词典》

7·He learned it by himself.

他是自学的。

8·Xu has learned English all by himself.

徐是自学英语的。

9·His father taught little Xu by himself.

他的父亲亲自教小徐。

10·Lily's father is learning Chinese by himself.

莉莉的爸爸正在自学汉语。