题目内容：
In a communicative grammar of the lesson, the teacher first presents a general aim of the lesson followed by clear instruction on the target grammar structure. Second, the teacher guides the students to complete a communicative task involving the grammar structure. Then the students review the grammar structure which is used in the communicative task. Fourth, the students are exposed to communicative materials containing the grammar structure in various ways. Finally, the teacher systematically re views the gram-mar structure after each communicative task.
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