Published in March 2023 as part of Event Cancellation in the Languages of Mainland Southeast Asia (東南アジア大陸部諸言語の事象キャンセル), this Japanese-language article by Shimizu Masaaki (清水政明) is titled “Event Cancellation in Vietnamese” (ベトナム語の事象キャンセル). The study examines how Vietnamese expresses situations in which an event or its expected result is cancelled or fails to materialize, despite an action having been initiated or attempted. Using a large set of Vietnamese example sentences, the author investigates the grammatical and semantic conditions under which speakers can describe an action in the first clause while subsequently denying its expected outcome. The article approaches event cancellation through a systematic series of semantic tests. These examine whether Vietnamese allows cancellation of such components as physical change in an object, perception or cognition of an object, movement, contact with an object, arrival at a destination, creation of an object, acquisition or possession, sound production, ingestion, the final state of an agent’s action, the initiation of an agentive action, and actions or emotions caused in another person. Examples include verbs corresponding to “cut,” “break,” “open,” “burn,” “move,” “build,” “buy,” “eat,” “drink,” “stand,” “sit,” and “run,” as well as various causative constructions. A central issue is the interaction between lexical aspect, grammatical constructions, and the interpretation of results. The analysis shows that Vietnamese verbs differ considerably in whether an expected result can subsequently be denied. In some cases, a sentence equivalent to “I did X, but the expected result did not occur” is acceptable; in others, the use of the verb itself entails that the result has already been achieved, making cancellation semantically contradictory. The article also tests how markers such as đã (anterior/perfective), rồi (completion), and constructions involving định (intention) affect these interpretations. The study pays particular attention to causative-resultative expressions. Vietnamese employs several causative constructions, including bắt, cho, and làm, but the possibility of cancelling the resulting event differs among them. The author finds that constructions with bắt and cho can permit cancellation of the expected result in a number of contexts, whereas constructions with làm tend to entail that the result has actually occurred. This distinction provides evidence that superficially similar causative constructions encode different relationships between the causing event and its result. The article concludes by organizing its findings across fourteen semantic categories, summarized in detailed tables at the end of the study. These tables compare whether cancellation is possible with the basic verb phrase, with đã + VP, and with VP + rồi, revealing substantial differences among Vietnamese predicates and event types. More broadly, the study demonstrates that event cancellation provides a useful diagnostic for understanding Vietnamese event structure, aspect, result entailment, and causative constructions. It is therefore particularly relevant to research on Vietnamese semantics, syntax–semantics interaction, lexical aspect, event structure, and causativity.