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Questions & Answers about Ella es la niña.
Do I have to include ella, or can I just say es la niña?
You can definitely just say es la niña. Spanish often drops subject words like yo, tú, and ella because the verb usually makes it clear who is doing the action. However, because es can mean "he is", "she is", or "it is", keeping ella in this sentence makes it perfectly clear that you specifically mean "she".
Why do we use es here for "is"?
Why is the word for "the" la instead of el?