This course on the language of Sri Lanka is intended to be taken under a Sinhala-speaking instructor. The present module is intended as a reference manual on Sinhala structures which will supplement and expand on the brief notes that appear in Module 2 (see related documents). After a brief explanation of the Sinhala sound system, the grammatical system is described under the following main headings: introduction to nouns, cases, definite and indefinite forms of the noun, basic classes of verbs, present tense forms, present verbal adjective form, past tense forms, infinitive form, participle, participial adjective, forms of verbs ("when,""if,""even if,""although," etc.), relationships among verbs, clause subordinator, nouns derived from verbs, adjectives, pronouns, postpositions, particles, numerals and quantity, word boundaries, spelling, and style and dialect. (JB)