Read the following sentences about lexical approach.

I. Lexis is not the basis of language.

II. Lexis is misunderstood in language teaching because of the assumptions that grammar is the basis of language and that mastery of the grammatical system is a prerequisite for effective communication.

III. Lexical approach stresses the necessity of using corpora to inform the pedagogical materials and the importance of regularly recycling and reviewing the language taught.

IV. One of the central organizing principles of any meaning-centered syllabus should be lexis.

The correct sentences are