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