Nobody taught my grandpa how to use WeChat, so he learned it all by himself.

没人教我爷爷怎么用微信，都是他自己学的。

He built the house all by himself.

他独自一人建造了这座房子。

Facts proved he did it all by himself.

事实证明他完全是独自完成的。

He became an oil baron all by himself.

他成了一个石油大王—一个白手起家的石油大王.

He became an oil baron---all by himself.

他成了石油大王，一个白手起家的石油大王。

Student: No, he did it all by himself.

学生：没有，他是独立完成的。

Now he's going to America all by himself.

现在，他自己一个人要到美国去了。

He became an oil baron --- all by himself.

他成了石油大王,一个白手起家的石油大王.

He constructed all by himself his dream city.

只独自把他理想中的都城建作。

He went to the bandits' lair all by himself !

这种硫磺会把黄蜂从 窝 里赶出来。