There is no best way to master a second language in a day but there is an effective way to acquire it. That is the reason why a teacher's role is so important, especially for the second language learners. There are many theories and hypotheses experimented and claimed by many scholars, but among many, there is no doubt that the best learning condition for students is to provide the massive comprehensible input and the low affective filter. However, output can be considered more important for learners to stretch their interlanguage ability. In addition, it stimulates learners to move from semantic processing to syntactic processing, so that they can notice what they do not know. In this way, learners can generate new linguistic knowledge or consolidate their existing knowledge. Therefore, this paper is going to mainly identify these two big theories, Input(roughly tuned input and caretaker speech) and output(noticing), and explain why and how these theories are instantiated.
             My unit theme is language. Even though massive input will be provided for four days lesson, which are Esperanto, The early history of the English language, Middle and modern English and Examining sources of English vocabulary, all lessons are logically connected each other, so students wouldn't get lost but would remain comprehensible. Furthermore, students could build up their competence gradually by comprehending input in addition to their performance throughout practice of the input in given activities. In order to make input more comprehensible, visual aids, caretaker speech, questioning and answering, summarizing were mainly used as a teacher's technique in the lesson. Showing the students a picture about the origins of the English language in warm-up stage and giving them the questions about the text on the board in presentation stage to give them some hints about the text before reading it could allow students to predict what the text would be like and th...