- Add emphasis to a whole sentence - You do have a point.
- Add sentences to an imperative. This use of emphatic softens a command and shows polite encouragement - Do come to the party!
- Contradict a negative statement - You're wrong. I did lock the door.
- Indicate strong concession - I do not enjoy horror movies, but I did enjoy "The Conjuring".
1 - Ethan did not worry about Jessica's son.
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