She is singing a song.
Meaning: This means that the female person is producing musical sounds with her voice. It's like saying, She is using her voice to make musical sounds that follow a certain tune.
Choice of Words: She refers to a female person. Is is a verb that describes a state of being. Singing is a verb that means to produce musical sounds with the voice. A refers to a particular song. Song is a piece of music with words that is sung.
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Related Expressions