Complete the sentences using might not have ... or couldn't have ... .

Certainly! Here's an example of completing the sentences using "might not have" and "couldn't have": 1. I called her several times, but she didn't answer. She might not have heard the phone ringing. 2. He arrived late to the meeting. He might not have set his alarm clock correctly. 3. The car was stolen from the parking lot. The thief couldn't have entered without a key. 4. They won the game by a large margin. The opposing team couldn't have played well. 5. She didn't attend the party last night. She might not have been feeling well. Remember, "might not have" suggests a possibility that something didn't happen, while "couldn't have" indicates that something was impossible or highly unlikely to have occurred.