Final answer:
The sentences are identified as subjunctive and indicative, and the correct mood for each sentence is provided.
Step-by-step explanation:
The first sentence 'Estoy seguro que Marcos quiere comer sus verduras' is indicative. The correct option for this sentence would be 2. indicative.
The second sentence 'No estoy seguro que Marcos quiera comer sus verduras' is subjunctive. The correct option for this sentence would be 1. subjunctive.
The third sentence 'No dudo que el perro desea jugar' is indicative. The correct option for this sentence would be 3. indicative.
The fourth sentence 'Dudo que el perro desee jugar' is subjunctive. The correct option for this sentence would be 4. subjunctive.
Learn more about Spanish grammar