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Questions & Answers about Como ele corre!
In English, we might say "How fast he runs!" Can como be used like this without an adverb?
Yes! In Portuguese, you can use como directly before a subject and verb to exclaim about the intensity or manner of an action. It implies "Look how much/fast/well he runs!" without needing to add extra words like rápido.
I know como is used in questions like Como estás?. Is its role different here?
Why doesn't this sentence use the subjunctive mood, since exclamations often show strong emotion?
Even though you are expressing emotion or surprise, you are stating an observed reality: he is actually running right now. Because it declares a real, observed fact rather than a doubt, wish, or feeling about someone else's action, it stays in the normal indicative mood (corre).