To speak English as a foreign language, it is necessary to know a certain amount of grammar which includes vocabulary and pronunciation (Bygate, 1987; Ur, 1996; Harmer, 2001). Form-focused practice, however, limits students’ choices of variation to talk. In addition, paying attention to accuracy sometimes discourages students from using the target language. As many of the Japanese students have anxiety about communicating orally in English, it is important to gain their confidence through speaking tasks. Having successful experiences can make students gain confidence (Locke, 1996), but the difficulty of achieving goals can also encourage students even though they fail to attain challenging goals (Mikami, 2017). To have a clear view of an ap...