3. He didn't wake up early, so he missed the bus. (IF) If he had woken up early, he

Solution: This is a third conditional sentence which describes an unreal past situation and its unreal past result. The given sentence is in the past simple and describes a real past situation.

Explanation:

• The first part of the sentence describes the unreal past condition: 'If he had woken up early...' (Past Perfect).
• The second part describes the unreal past result. The structure for the result is: 'subject + would have + past participle'.
• The original sentence states that because he *didn't* wake up early, he *missed* the bus. The 'if' clause describes the opposite of what happened.
• Therefore, if he *had* woken up early, he would *not have missed* the bus.

Answer: If he had woken up early, he would not have missed the bus.