- 12 Sections
- 12 Lessons
- 12 Weeks
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- Unit 11
- Unit 21
- Unit 31
- Unit 41
- Unit 51
- Unit 61
- Unit 71
- Unit 81
- Unit 91
- Unit 101
- Unit 111
- Unit 121
Been there, done that. Grammar – Present Perfect. Simple and continuous. Informal letters.
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