Krashen's monitor model theory SLA（ｓｅｃｏｎｄ　ｌａｎｇｕａｇｅ　ａｃｑｕｉｓｔｉｏｎ） ‎Please briefly talk about five hypotheses of Krashen's monitor model Ｉ’ｍ　ｎｏｔ　ｕｎｄｅｒｓｔａｎｄ　ｓｏ　ｗｅｌｌ　and combine your  language learning experience. Thank you.