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3.be on fire着火,表状态。如:
Look out! The pan is on fire.
catch fire 表动作
eg: The house caught fire last night.
on the fire指的是炉火
eg: The pan was on the fire.
4.现在分词作状语表示伴随情况。句中有两个以上的动作,除主要动作用谓语动词表示外,另一个伴随动作均可用现在分词来表达。如:
The next moment the first wave swept her down, swallowing the garden.
Before they reached the house, a new great wave came, sweeping down trees, and sweeping them down too.
I sat at the gate, waiting for my mum.