Writings from various genres in Indonesian as a third language contain a line of thought consisting of three main elements: establishment, evidence, and conclusion. These three elements, in this study, are used as the basis for determining the reasoning patterns of making a conclusion in the third language. This research applies a qualitative approach. The data sources of this research are Indonesian sentences written by foreign speakers learning Indonesian language. Data analysis was carried out using the content analysis technique. The results of the analysis show that the patterns of reasoning in the preparation of conclusions tend to be inductive, deductive, and syllogistic

Keywords : Reasoning Patterns, Drawing Conclusions, Target Language, Third Language.