1. IA Past Simple (affirmative forms of regular verbs)

2. IB Present tense contrast

3. IC Adjectives

4. ID Articles

5. ID Will and going to

6. 1D Used to

7. 1E Phrasal verbs

8. 2A Present simple and adverbs of frequency

9. 2B Present perfect simple and past simple contrast

10. 2D Present perfect simple and continuous

11. 3B First conditional

12. 3B Speculating and predicting

13. 3D Future continuous and future perfect

14. 4A Some, any, much, many

15. 4B Comparison

16. 4D Second conditional

17. 4D I wish/If only

18. 4H Would rather, had better