Unit 12 Mainly Revision 说课稿(5)

　　c 30 cm by 30 cm by 50 cm.

　　We describe two-dimensional and three-dimensional measurements using the word by. So the length of the tank is 50 cm, and the width and height both 30 cm.

　　e underwater plants:

　　These plants oxygenate the water and keep it clean.

　　d For one thing = one reason (for putting plants in the tank)

　　Step 4 . Dialogue Drill

　　1.In this step the students are required to practise the dialogue in pairs by reading the dialogue aloud. This step is employed to make the students grasp the useful phrases and sentences pattern for making suggestions and replying on the base of reading the dialogue fluently.

　　2.Let the students find out the expressions and sentence patterns for making suggestions and replying in this dialogue , in the meanwhile show these expressions and sentence patterns on the screen by computer one by one. This step is employed to give the students a deep understanding of those expressions.

　　Step 5 . Practice (part 2)

　　In fact, this step is intend to deal with the second part of the lesson(part 2). First show the words and phrases given on the screen, using a multi-media computer, then ask the students to make short dialogues with their partners to practise making suggestions and replying, using the phrases given in the table of Part2 .Give the students 5 minutes to prepare it. Ask the students to pay particular attention to sentence stress and intonation. At last ask some pairs to act their dialogue out in front of the whole class. This step is employed to make the students get a further understanding of these expressions.