The purpose of this research was to determine wheter using CLT (Communicative Language Teaching) can improve pupils’ speaking ability at Prateepsat Ismail Memorial School or not. This research used a quasi-experimental research that required a pre-test and a post-test for both groups. The research population was pupils in grade 2, where class 2/2 as an experimental class consisiting of 36 pupils and class 2/1 as a control class consisting of 36 pupils. In collecting data, reseracers used test. The test consisted of a pre-test and post-test. Data were analyzed statistically. After being analyzed, the result of t-counted was 11,977 with 70 degrees of freedom and a significance level of 0,05, the table is 1,666. This research used a significance level of 0,05 because it has moderate accuracy. Therefore the result of t-counted is higher than t-table. It means that the hypothesis of this research is accepted. In conclusion, there was a significant effect in using CLT (Communicative Language Teaching) to improve pupils’ speaking ability of the second grade at Prateepsat Ismail Memorial School, Thailand.
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