1) Debería plantar más árboles. a) She may plant more trees. b) She should plant more trees. c) She must plant more trees. 2) No debo gritar en la biblioteca. a) I should not shout in the library. b) I could not shout in the library. c) I must not shout in the library. 3) Puede que tengas que cocinar la cena esta noche. a) You may have to cook dinner tonight. b) You will have to cook dinner tonight. c) You must have to cook dinner tonight. 4) Podría limpiar la casa mañana. a) I should clean the house tomorrow. b) I could clean the house tomorrow. c) I may clean the house tomorrow. 5) Estudiarás mucho para tu examen. a) You must study hard for your exam. b) You might study hard for your exam. c) You will study hard for your exam.

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