Preliminary data of the biodiversity in the area VNU Journal of Foreign Studies, Vol 37, No 1 (2021) 43 54 43 AT VIETNAM CONVENTION CENTRE A MOOD SYSTEM ANALYSIS Nguyen Thu Hanh*, Nguyen Tien Lam Military Science Academy Kim Chung, Hoai Duc, Hanoi, Vietnam Received 3 November 2020 Revised 30 December 2020; Accepted 25 January 2021 Abstract This study investigated the interpersonal meaning which lies on the diplomatic speech delivered by Barack Obama at Vietnam Convention Centre The purposes of t[.]