1. We can show contrast between something that's true and something that's false: She does know how to swim, she just doesn't want to go swimming with you! He says he didn't steal the book but I saw him. He did steal it.
2. We can show contrast between a general rule and an exception: I don't like sports very much but I do love watching tennis. She doesn't eat meat or fish but she does eat eggs.
3. We can show contrast between how something looks and how it really is: She makes ice-skating look easy but she does practise every day for hours. They fight like cat and dog but deep down they really do love each other.
4. We can show compare what is expected with what actually happens: He said he was going to fail his exam and, sure enough, he did fail! She thought she wouldn't like the museum but she really did enjoy herself there.
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