Let's classify each sentence as a simile or a metaphor:
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Time is money - This is a metaphor because it implies that time and money are equivalent in value without using "like" or "as."
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Her eyes are as blue as the sky - This is a simile because it uses "as" to compare her eyes to the sky.
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The students were as busy as bees - This is a simile because it uses "as" to compare the students' busyness to that of bees.
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The boy's room is a tornado - This is a metaphor as it suggests that the room's state of disarray is equivalent to a tornado without using "like" or "as."
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Her voice was music to my ears - This is a metaphor because it equates her voice with music without using "like" or "as."
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The cat's eyes sparkled like diamonds in the sunlight - This is a simile because it uses "like" to compare the cat's eyes to diamonds.
In summary:
- Metaphors: 1, 4, 5
- Similes: 2, 3, 6