đáp án + giải thích:

1, Had I known about the traffic jam, I would have left earlier.

2, Had she studied more diligently,  she could have passed the exam with flying colors.

3, Had they prepared better,they might have won the competition.

4, Had we checked the weather forecast, we could have avoided the rain.

5, Had he remembered the appointment,he would have attended the meeting.

$--------------$

-  câu $Type III$ $ If + S + had + Pii + O, S + would/... have + Pii + O$

 đảo ngữ $=>  Had + S + Pii,..........$

#$Nan$