The Ateso language has had very little publication. A detailed analysis of tense and aspect in Ateso has not been studied. The way tone, tense and aspect are interrelated across the Eastern Nilotic language family differ. This is the reason for writing this book whose main focus will be on Ateso. The book offers an analysis of tense and aspect in Ateso. It seeks to investigate tense and aspect marking, the distribution of tense and aspect and its correlation with tone. The book also looks at the order of occurrence of tense and aspect in basic sentence structures and assess whether tense and aspect morphological forms can be adequately described by the Checking theory of the Minimalist program. It provides an avenue of comparison of the Nilotic languages which are mutually intelligible with Ateso. It will be useful to linguists studying Eastern Nilotic languages. The linguists will find the book useful in comparison of tense and aspect marking in these languages with Ateso.