This chapter is divided into two main sections. §14.1 provides general information about the tense-aspect system. Some readers might prefer to skim through this section and instead focus on §14.2, which describes the tense-aspect affixes in detail. There are various other grammatical resources that express notions related to tense and aspect, but whose main functions lie elsewhere. Information about these categories is found in other chapters. See e.g. the Neutral Orientation, whose allomorphs distinguish between present and non-present (§11.1.2); the Deictic prefixes, which are restricted to present time contexts (§15.4); and the pre-verbal adverbials, expressing negation and various aspectual notions (§18.4).