The key to exercise solutions in chapter 6c - Grammar in use for the textbook On Screen B2+ - Student's Book with authors Virginia Evans and Jenny Dooley from Express Publishing
Question
Rewrite the sentences using mixed conditionals.
Answer
If he had started studying earlier, he wouldn’t be panicking about his exam.
If they were interested, they would have joined the chess club.
If she hadn’t been at the gym all day, she wouldn’t be exhausted now.
If he had made an appointment, he could see the doctor.
If she weren’t so clumsy, she wouldn’t have broken the vase.
If they left the gym an hour ago, they will be home now.