2 I could hear the music but I couldn’t see who was playing it

3 It was great to see you. I’m so happy that you could to come.

4 We couldn’t went to the beach because it was raining.

5 In the past, you couldn’t to travel from London to Paris by train.

6 The exam was very difficult. I can’t understand the questions.
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2 I could hear the music but I couldn’t see who's been playing it3 It was great to see you. I’m so happy that you could come.4 We couldn’t go to the beach because it's been raining.5 In the past, you couldn’t travel from London to Paris by train.6 The exam was very difficult. I couldn't understand the questions.