精选优质文档-倾情为你奉上四现在进行时定义:表示当前正在发生的事情句型结构:主语+谓语动词+(宾语)谓语动词:am/is/are +doing (动词ing形式)*注意:进行时态的中出现的动词必须是持续性动词,而非短暂性动词。动词ing形式的变化规则:1. 在词尾+ing,如playplaying;2. 当动词以重读闭音节结尾且结尾只有一个辅音的时候,双写末尾的辅音+ing,如runrunning;3. 当动词以辅音+e结尾时,去e+ing,如makemaking4. 不规则变化: lielying diedying例1:We are having an English class.例2: I am doing my homework.例3: Mary is cleaning the window.例4: You are reading a book.句型转换:变为否定句:We are not having an English class.(在be动词之后加not)