She sang a beautiful song for us.
Meaning: This means she produced musical sounds with her voice that were pleasing to our senses.
Choice of Words: Sang means to produce musical sounds with your voice. Beautiful means pleasing to the senses or mind. Song is a piece of music with words that is sung. For means intended for or directed towards someone. Us refers to the people speaking or writing. When you put them together, "She sang a beautiful song for us" describes the action of someone singing a pleasing piece of music intended for our enjoyment.
Alternative Expressions
Related Expressions