A bird sings sweetly in the tree.
Meaning: This sentence is describing a bird making beautiful sounds while sitting in a tree.
Choice of Words: Bird is a warm-blooded animal with feathers and a beak. Sings means to produce musical sounds with your voice. Sweetly means in a pleasant and charming manner. Tree is a tall plant with a woody stem and branches. When you put them together, this sentence describes a bird producing pleasant sounds in a tree.
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Related Expressions