连接副词: when, where, how, why Why he did it remains a mystery.

　　it作形式主语

　　It+be+表语+主语从句 It is still uncertain whether he is coming or not.

　　It+不及物动词+主语从句 It happens that they were absent.

　　It+及物动词（被动语态）+主语从句 It has been decided that the exhibition will not open on Sundays.

　　活动与探究

　　Suppose you are to design an activity for your school on Earth Day, which is intended to call on teachers and students to protect the earth. Work in groups and choose a reporter of your group to report your work. The following points should be included in the report of your activity:

　　what the activity is about;

　　why the activity is designed;

　　when and where to do the activity;

　　who takes part in the activity;

　　what to be done in the activity.

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