Respuesta:
Claro, aquí tienes las oraciones completadas con los verbos modales apropiados:
1. I'm getting married next week. You **must be** joking!
2. Hugh never does any work but he's always at the top of his class. He **must be** a very clever boy.
3. This **must be** John's coat. There's a letter addressed to him in his pocket.
4. He was terribly tired after walking six kilometres. He **can't be** as strong as people think.
5. We haven't made any plans for our holiday yet. We **might go** to Greece, or we **might** even stay at home.
6. I've been travelling since four o'clock. You **must be** tired.
7. Tom **can't have written** this because it's in French and he doesn't speak French at all.
8. There's somebody at the door. Do you think it **could be** the postman?
9. Isn't that John over there? No, it **can't be** him, he's much taller than that.
10. Janet **can't have caught** the 8.30 train because she left the house at 8.31.
11. Hercules killed two snakes that crept into his cot. He **must have been** a very strong baby.
12. The prisoner **must have escaped** that way because there are his footprints.
13. I **might go** to Spain next week, but I'm not sure yet.
14. I wonder where Emma is. She **could be** with Nelly, I don't know.
15. Don't phone her now. She **might not be** at home. Perhaps it's too early.
Espero que esto te ayude a entender cómo se usan los verbos modales en estos contextos.
