Cover of the textbook Spark 4 - Student's Book

The key answer of exercise 2

A: What did you do yesterday? B: Well, we woke up and the sun was shining and the birds were singing so we decided to go for a walk.
A: Last night, I called Steve on the phone and then I went round to his house, but he wasn't there. B: That's because he started his night shift yesterday.
A: Why didn't you tell me my phone was ringing ? B: You were sleeping so soundly that I didn't want to wake you up.

The key to exercise solutions in chapter 2b - Grammar for the textbook Spark 4 - Student's Book with authors Virginia Evans, Jenny Dooley from Express Publishing

Chapter

Exercise