1. What is a sentence?  
　　A sentence is a grammatically self-contained speech unit that expresses a statement, a question, a command or an exclamation. In speaking it is phonetically distinguished by various patterns of stress, pitch, and pauses; and in writing it concludes with appropriate end punctuation, such as a period, a question mark or an exclamation mark.  
 
2. Sentence elements  
　　The parts of a sentence include subject, predicate, object, complement, attribute and adverbial. They may be a word or a group of words (i.e. phrase). 

（to be continued）