精选优质文档-倾情为你奉上现在进行时一、意义当表示现在正在进行的动作或正在发生的事。时间标志now，句前的look ,listen二、构成:be (am, is ,are )+动词现在分词-ing形式肯定句： 主语 + be + 现在分词V-ing (+ 其他)Im doing my homework now .否定句：主语+be+not+动词-ing +其他.Im not doing my homework now.一般疑问句：Be+主语+动词-ing +其他?Are you doing your home work now?Yes, I am . No , Im not .特殊疑问句：特殊疑问词+be+主语+动词-ing+其他?What are you doing now ?类型构成例句肯定句主语+be(am/are/is)+doing+.I am singing.我正在唱歌。否定句主语+be(am/are/is)+not+doing+.They aren
