Chinese, as an aspect language, has played an important role in the development of aspect theory. This book is a systematic and structured exploration of the linguistic devices that Mandarin Chinese employs to express aspectual meanings. The work presented here is the first corpus-based account of aspect in Chinese, encompassing both situation aspect and viewpoint aspect. In using corpus data, the book seeks to achieve a marriage between theory-driven and corpus-based approaches to linguistics. The corpus-based model presented explores aspect at both the semantic and grammatical levels. At the semantic level a two-level model of situation aspect is proposed, which covers both the lexical and sentential levels, thus giving a better account of the compositional nature of situation aspect. At the grammatical level four perfective and four imperfective aspects in Chinese are explored in detail. This exploration corrects many intuition-based misconceptions, and associated misleading conclusions, about aspect in Chinese common in the literature.