Underline the incorrect modal verb and replace it with a more suitable one. Sometimes more than one answer is possible. 1. They mustn't have seen Max-he's away on holiday. 2. Joe knew about the strike. He must have warned me! 3. I couldn't have yawned when Tim told that story. It was a bit rude of me. 4. It was so noisy. It's possible he ought not to have heard us. 5. I emailed Erin a week ago, so she can't have read it by now. 6. I don't know if Jake is coming. I left a note for him but he should not have seen it.

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