Matching Pairs PossibilitiesOnline version revising modals for degrees of certainty in the past, present and future by Canan Schaerer 1 That's the doorbell. Do you think they're here already? 2 Someone's left their umbrella here. 3 She must be his girlfriend. 4 Someone was at the door a few minutes ago. 5 I can't read this signature – can you make anything of it? 6 Eddie was very quiet this morning. 7 Happy birthday! Can you guess what it is? 8 I can't find my keys. 9 Look! What's that? It can't be a plane. 10 I'm starving! Is there anything to eat? 11 Do you think Gran's alright? She's not answering her phone. 12 Who's that sitting next to Andrew? It's flying too low. Look, they're holding hands. The surname could be Smith. That looks like an 's'. She might be having a nap. She often does after lunch They can't be. They only left ten minutes ago and it takes an hour. He must have been tired – he flew back from London last night. It must have been the postman. He always comes at eight. You can't be hungry again! You've only just had lunch. You might have left them at work. It must be his dad. He looks just like him. It can't be a book - it's not heavy enough. Is it a video game or a DVD? It might be Laura's. She was in here earlier.