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Hi,

Is there any difference between "I eat" and "I do eating" ?

If they are, what would they be?

Thanks.
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Alex is correct about inserting do for emphasis. However, when we do that, we use the pure infinitive eat rather than 'eating'. "I do eating" is totally incorrect.
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Hi,

However, if you are taliking about classes or activities, you can rather informally say things like this.

eg I do dancing on Wednesday evenings, and I do swimming on Saturday mornings.

Clive
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Comments  
If you insert do between the subject and the verb you make the entire expression a bit stronger."Do" is often used to emphasize and to stress a certain meaning.The continuous form "eating" indicates that you are eating at the moment.
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I eat