现在进行时He is walking .What are the boys doing? They are fishing.They are dancing.He is swimming.你观察出了 什么？He is singing. (sing singing) He is walking. (walk walking ) She is laughing. (laugh laughing ) He is swimming. (swim swimming) They are dancing.(dance dancing) They are fishing . (fish fishing ) 定义：表示现在正在进行或发生的动作 构成：be+ 动词的现在分词 （be 的形式随着人称、数的变化而变化） be am is are 1 ， 一般情况下，在动词原形后直接加-ing. singsinging ( 唱歌) laughlaughing （笑） walkwalking （走） fishfishing （钓鱼） 2 ， 以不发音的字母e 结尾的动词，去掉e ，再加 -ing. danceda
