Part 1 Social communication
Unit 1 Starting a conversation，introduction and greeting
Unit 2 Congratulations and thanks
Unit 3 Permission—seeking and Ieave—taking
Unit 4 Request， offer， acceptance and refusal
Unit 5 Persuading， giving advice and expressing enthusiasm
Part 2 Atritudes and Feelings
Unit 6 Apologizing and complaining
Unit 7 Intentions， promises，reminding and remembering
Unit 8 Obligation， instructions，commands and warnings
Unit 9 Likes， dislikes and preferences
Unit 10 Possibility and impossibility， certainty and uncertainty
Unit 11 Real conditions and unreal conditions
Unit 12 Worry， happiness and unhappiness，disappointment
Part 3 Dircctions，frequency and cstimation
Unit 13 Directions and distance
Unit 14 Weather， temperature and frequency
Unit 15 Average， estimation and approximation
Part 4 Discourse control
Unit 16 Comparison and contrast， generalization and conclusion
Unit 17 Causes and effects， aims and purposes
Unit 18 Describing， narrating and interpreting
Unit 19 Giving opinions，agreeing and disagreeing，exemplifying
Unit 20 Language difficulties and hesitation fillers
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