Final answer:
The sentence "Carlos prometí una nueva casa a Lucy." is incorrect as written. The correct sentence should be "Carlos prometió una nueva casa a Lucy."
Step-by-step explanation:
The sentence "Carlos prometí una nueva casa a Lucy." is incorrect as written. The correct sentence should be "Carlos prometió una nueva casa a Lucy." The verb "prometí" is in the incorrect form. It should be "prometió" to agree with the subject "Carlos".
Learn more about Sentence structure in Spanish