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Questions & Answers about Esa cosa es nueva.
Why is it esa instead of eso?
Eso is a neutral word used when you do not know what an object is or when you are talking about a general idea. But here, you are specifically pointing to a cosa (thing). Because cosa is a feminine noun, you must use the feminine word esa (that).
Why do we use es here instead of está?
How would this sentence change if I were talking about a masculine object, like a carro (car)?
How could I use a question word like qué with this phrase?
Since your current lesson is about question words, you might wonder how to ask about this object. If you wanted to ask what the thing actually is, you would use the interrogative word qué (what). For example, you could ask ¿Qué es esa cosa? (What is that thing?).