帮忙翻译一下下面一句话

1我看到过有的外国人在自己国家教一些外国人学习本国语言，

2还有的人在中国教中国人自己的母语。

3这样可以赚一些额外的收入

1. I saw that some foreigners in their own country to teach the others to learn their native tongue.

2. Some others teaches Chinese their mother tongue in China.

3.Thus they could earn some extra income.

1 I've seen some foreigners in their country to teach some foreigners learn their language,

2 and the people in China to teach Chinese their mother tongue.

3 so to earn some extra income

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