2.4 Past Simple & Continuous
Exercise 3:PS examples: didn't empty, called, wanted, forgot, were, had, fell, was, texted.
PC examples: were chatting, were doing, were studying, were crossing, were talking.
Exercise 4:
1: were eating, heard 3: when 5: when
2: started, were swimming 4: took, was travelling 6: fell, was skating
Exercise 5:
2: had - 3: changed - 4:were walking
5: were waiting - 6: heard