现在进行时
1.概念：表示现阶段或说话时正在进行的动作及行为.
2.时间状语：now,at this time,days,etc.look .listen(进行时的一般标志)
3.基本结构：be+doing He is doing his homework now.
4.否定形式：be+not+doing.He is not doing his homework now.
5.一般疑问句：把be动词放于句首.Is he doing his homework now.
现在进行时
1.概念：表示现阶段或说话时正在进行的动作及行为.
2.时间状语：now,at this time,days,etc.look .listen(进行时的一般标志)
3.基本结构：be+doing He is doing his homework now.
4.否定形式：be+not+doing.He is not doing his homework now.
5.一般疑问句：把be动词放于句首.Is he doing his homework now.