Greetings
Explanations
Instructions
Needs and Wants
Opinions 
Phrases
Feelings
Formal Language
Informal Language
Things
Conditions

Giving Advice and Recommendations  
Asking for Help or Clarification  
Making Requests  
Expressing Opinions and Preferences  
Disagreeing Politely  
Compliments and Praise  
Apologies and Sorry  
Negotiations and Deals