The birds sang sweetly all day long.
Meaning: This means that the birds were singing in a pleasant and melodious manner for the entire day.
Choice of Words: Birds are warm-blooded vertebrates constituting the class Aves, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Sang means that the birds were producing musical sounds with their voices. Sweetly means that the birds were singing in a pleasant and melodious manner. All day means from morning until evening. Long means for a period of time. Put together, it means the birds were producing musical sounds with their voices in a pleasant and melodious manner for the entire day.
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