Study the characteristics of the Thai language, appearances and sounds of the Thai consonants, vowels, Wan-na-yuk, Trai-Yang, Mattra Mae KoKaa, Mattra-Tua-Sa-Kod, Kam-Pen-Kam-Tai, the use of Laksana-Nam, Kam-Pong-Roop-Pong-Seang, type and functions of words, borrowed words, word, phase and sentence constructions, saying and proverbs, Ra-Cha-Sup, the use of dictionaries and language levels.