Read the sentences and decide if they describe possibility, probability or certainty. 1 Stella can't be ill in bed - I saw her at volleyball practice 10 minutes ago! 2 Jason might be at the park. Why don't you call him and find out? 3 The doctor gave her a prescription so she should be at the chemist's now. 4 Jack needs more exercise. He must be swimming at the pool. 5 Antonia left here an hour ago, so she ought to be at the hospital by now. 6 I don't know where Nick is, but he could be working out at the gym. 7 I didn't see Cara at school today - she may still be sick with the flu.