1. She's wearing a nurse's uniform. She must be a nurse. 2. I don't know if Dominic's here - he might be outside.3.She isn't here and she hasn't rung. She could have forgotten our appointment.4. He spoke to me about it this morning so he couldn't have forgotten about it.5. I think it will rain this afternoon - it's very cloudy.6. A:Why didn't she come to the party last night? B: I don't know. She might be feeling tired.7.Mickey could be going out. He's wearing a coat and boots. 8. That mustn't have been Davina you saw last night. She's abroad. 9.Our neighbours should be going away. Their cases are packed and there's a taxi waiting for them.10. Some scientists believe there may be life on other planets.