Books such as A Grammar of Spoken English on a Strictly Phonetic Basis，A Handbook of English Grammar，Guide to Patterns and Usage in English served as a standard ______ source of basic English sentence patterns for textbook writers.

What are the principles that Asher believes in?

What are the four points summarized by Tang Lixing on the methodological development before the 1980s in China?

What is the primary goal of the Natural Approach?

Discuss in your own words the advantages of the Direct Method.

How does the teacher mat practices the Oral Approach deal with students’ errors?

What is language in Chomsky’s opinion?

Could you please name any two of Daniel Jones’ works on English phonetics?

What is the learning theory of the Direct Method according to J.A. Comenius?