三、句型转换:1. They are doing housework .一般疑问句:_ 否定句: _2The students are cleaning the classroom . 一般疑问句:_ 否定句: _3Im playing the football in the playground .(对划线部分进行提问)_4Tom is reading books in his study . (对划线部分进行提问)_四、现在进行时:表示现在进行的动作句子结构:be+动词ing时间状语:now, look, listen,Its oclck,1. What are you _(do) now? I _(eat) bread.2. Its nine oclock. My father_(wor