This unit is the fourth unit of the seventh grade volume one of the English textbook published by the People's Education Edition. The content of the textbooks is aimed at students who have just entered the junior high school, and trains students to learn to communicate with others. The content of the textbooks is close to life and easy to be understood by students. At the same time, because the teaching situation is often based on students’ daily life, students are more likely to develop self-confidence and a sense of participation, which helps students build confidence in English learning and improve the efficiency of English learning. Use the positional prepositions “in, on, under” to skillfully to express the position of objects, and the ability to use “where” question sentences and general question sentences to ask and answer questions is the focus of this unit. After studying this unit, students can use key words, phrases and target language to talk about the location of objects. A total of 5 class hours are arranged for this unit.