Showing the relationship between cause, effect, and human reaction (e.g., The noise was so loud that... ).
Lesson 21 represents the core philosophy of the Practice and Progress book: The text is short—often only 100 to 150 words—but it is dense with teachable content. New Concept English Practice And Progress Audio 21
If you are referring to , Lesson 21 is titled "Which book?" . This much simpler lesson focuses on basic object identification and the use of the word "one" as a pronoun (e.g., "Give me a book, please... Which book? This one?"). " or perhaps exercises related to its grammar? New Concept English 2 | PDF - Scribd Showing the relationship between cause, effect, and human