Here’s how each of your examples corresponds to the literary devices you mentioned:
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Hyperbole: "I haven't seen you in forever."
- This phrase exaggerates the concept of time to emphasize the length of time since the last meeting.
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Idiom: "After a long day, I couldn't wait to hit the sack."
- "Hit the sack" is an idiom meaning to go to bed or go to sleep, which does not relate to actually hitting a sack.
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Onomatopoeia: "The door slammed shut with a long bang."
- The word "bang" imitates the sound of the door slamming, making it an example of onomatopoeia.
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Alliteration: (Not present in the examples given, but an example could be something like "She sells seashells by the seashore,” where the repetition of the initial 's' sound creates alliteration.)
If you’d like to see a new example of alliteration or need further clarification, let me know!