Ｆｏｒ　ｉｎｓｔａｎｃｅ　淨係　Ｆｏｒ　ｉｎｓｔａｎｃｅｓ　先啱？

You can use both as long as you have two or more instances/ examples:

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For instance:

There are jobs more dangerous than truck driving, for instance, training lions.
有些工作比開卡車還要危險,例如馴獅就是。

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For instances:

Let me give you some instances.
讓我給你舉幾個例子。

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hope this can help you la......actually this is just the same as the word "example"....you can say wheather "example" or "examples" too....And I hope this can help you la...^^

應該係 For instance 我自己就未見過第二個, 用法同 For example 一樣

For instance, he goes to school every Monday.

For example, he goes to school every Monday.

2007-07-02 13:47:00 補充：
我查過字典在for 後面係用FOR INSTANCE 係冇S 架!