Subject
General Earth and Planetary Sciences,General Environmental Science
Reference18 articles.
1. Perkins, M.R. (1983) Modal Expressions in English. Frances Pinter (Publishers), London, 1-12.
2. From Etymology to Pragmatics
3. Halliday, M.A.K. (1994) An Introduction to Functional Grammar. 2nd Edition, Edward Arnold, London.
4. Using corpus methods to analyze modal verbs in government science communication on Twitter
5. Modal Verb “Shall” in Contemporary American English: A Corpus-Based Study