互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒例如：Rice is planted in the south of China.
2. 一般过去时 was/were 过去分词
例如：These trees were planted the year before last.
3. 一般将来时 will/shall be 过去分词
例如：A sports meeting will be held next week in our school.
4. 现在进行时 am/is/are being 过去分词
例如：Your radio is being repaired now.
5. 过去进行时 was/were being 过去分词
When he got there，the problem was being discussed.
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