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This study examined four different proficiency levels of ESL learners’ use of tense (present/past) and aspect (simple/perfect/progressive) in English academic writing compared to native speakers’ corpus data from the Longman Spoken and Written English Corpus. The results showed that the ESL learners’ proficiency levels did not significantly affect the use of tense. However, regarding aspect, a statistically significant difference was found in perfect aspect. The higher proficiency group showed similar tendencies both in tense and aspect to native speakers. With respect to differences between native and non-native speakers, there were statistical differences in all types of tense and aspect, with the exception of progressive aspect. Compared to ESL learners, native speakers tend to use more past tense and perfect aspect.