On September 12, 2023, recently at the American Intercon School, Head Office there was a teaching demonstration led by ESL teachers which was taught by Mr. Enel Sok. In addition, the program was participated by ESL teachers and facilitated by deputy head teachers. This program aimed to contribute effective techniques of teaching vocabulary related to “Occupation”, and these techniques allow students to pronounce and understand the meaning of the words correctly. Meanwhile, students were using words they had already learnt by playing the most exciting game called the Guessing Words happily. At the end of the sharing, the observers had the opportunities to ask questions, solve problems, exchange teaching experiences, give comments and points to improve to the teacher to develop their teaching to be more effective.