SUMMARY
This paper investigates the uses of the aorist and the progressive tenses in spoken Turkish and the extent to which they are used interchangeably. Demo version of Spoken Turkish Corpus was analyzed using EXMARaLDA software. The tokens were divided into the categories of uses. Results indicate that there were a total of 206 tokens of the aorist and 628 occurrence of progressive tense. Assumptions and commitments are the most common uses and they account for the 56% of the uses of the aorist. These functions have indefinite future meaning. Three functions of the progressive, namely progressive (event), progressive (state) and repetitive/habitual, on the other hand, account for 96% of all its uses. Of these, repetitive/habitual is used 19.26% of the times. When interchangeable functions are considered, analysis revealed that 76% of them are expressed in the progressive tense. Results have implications for curriculum and materials development and teaching practices.