Language Focus:
　　do well in; keep your classroom clean and tidy; Collect waste paper for recycling; pick flowers; Step on the grass; cut down trees

Properties: Recorder; Overhead Projector; Pictures

Teaching Procedures:
　I. Showing aims
　　Get the students to know what they will learn in this lesson and what they should do in this class:
　　  1. Master some useful expressions.
　　  2. Revise the contents of Unit 3.
　　  3. Train their listening ability.
　　  4. Improve their writing ability.
　　  5. Go through Checkpoint 3.

　II. Revision
　　  1. Revise the useful expressions in Unit 3. Ask the students to do some translations, translate some sentences into English.
　　  2. Revise the Present Perfect Tense. Ask: How long have you been a … ? What have you done since you became …? Get the students to ask and answer in pairs.