Unit1 Possibility and implssibility 1
Unit2 concentration and interruption 7
Unit3 Interest and Boredom 14
Unit4 Insisting and Urging 21
Unit5 Reassuring and Persuading 28
Unit6 Condition and Concession 36
Unit7 Deducing and Concluding 46
Unit8 Obligation and Necessity 55
Unit9 Defining and Exemplifying 63
Unit10 Curiosity and Lgnorance 69
Unit11 Listing and Summarizing 77
Unit12 Tolerating and Criticizing 84
Unit13 Cause and Effect 91
Unit14 Prediction and Judgement 98
Unit15 Correcting and Explaining 106
Unit16 Clarifying and Repeating 112
Unit17 Hesitation and Confidence 119
Unit18 Hopes and Desires 126
Appendix I 132
Appendix II 136
Appendix III 141