This study investigated errors in learning English grammatical structures related to the present tense and aspects among Matthayom 4-5 students in Thailand. A pre-test was administered to 20 students to analyze errors in the present simple, progressive, and perfect tenses. Results found the highest percentage of incorrectness in the present perfect tense (99%) followed by the present progressive (90%) and present simple (73.7%). Common errors included using the wrong tense, omitting verb inflections, and providing unidentifiable forms. Based on the findings, the researcher plans to develop English teaching materials focusing on the correct usage of present tenses and aspects, including vocabulary cards and academic activities, to help students overcome these difficulties.