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 Eddie was very quiet this morning. 3 I can't find my keys. 4 She must be his girlfriend. 5 Someone was at the door a few minutes ago. 6 Who's that sitting next to Andrew? 7 Look! What's that? It can't be a plane. 8 I'm starving! Is there anything to eat? 9 Someone's left their umbrella here. 10 I can't read this signature – can you make anything of it? 11 Happy birthday! Can you guess what it is? 12 Do you think Gran's alright? She's not answering her phone. It might be Laura's. She was in here earlier. The surname could be Smith. That looks like an 's'. You can't be hungry again! You've only just had lunch. It's flying too low. You might have left them at work. Look, they're holding hands. She might be having a nap. She often does after lunch 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. It must have been the postman. He always comes at eight. They can't be. They only left ten minutes ago and it takes an hour. It must be his dad. He looks just like him.