The key to exercise solutions in chapter 4.4 - Communication for the textbook Wider World Starter - Student's Book with authors Catherine Bright and Sandy Zervas from Pearson Education
Question
Write dialogues for the pictures. Then act out the dialogues in pairs.
Answer
B: I’m so sorry! / Sorry about that. A: It’s OK. / That’s all right. (also: No problem.)
B: Sorry, my mistake! A: No problem. / It’s OK. / That’s all right.