1. Zaure couldn't / wasn't able find her keys, so she got in through an open window. 2. Robert must / can't have a cat. He hates cats. 3. If you start taking Spanish lessons, you will be able to I can speak Spanish in a few months. 4. Andy must / can't be out. His car isn't in the garage. 5. I'm not feeling very well, so I couldn't / may not come to the party tomorrow 6. Tina might / must beat Danny at tennis if she continues to play well.