Use the prompts and the verbs in brackets to complete the sentences with the past modals.
1. harry looks upset. he (have) some bad news. (i am not sure)
2. my bicycle isn't there! someone (steal) it! (i am sure it happened)
3. this book is 600 pages long. you (read) it in one day! (i am sure it didn't happen)
4. there's a cake in the fridge. mum (go) to the supermarket. (i am sure it happened)