精选优质文档-倾情为你奉上现在（正在）进行时2015.7.17【定 义】现在（正在）进行时表示说话的瞬间正在进行或发生的事情。如：They are singing and dancing happily now . 他们正在高兴地唱歌跳舞。 She is showing her friend around the city . 她正在带一位朋友游览城市。【结 构】主语+ be（am / is / are）+动词的-ing形式。肯定句形式：I + am 动词ing. 如：I am reading (read) an interesting story book now.She/He/It + is 动词ing. 如：Tom is reading (read) an interesting story book now.We/You/They + are动词ing. 如：They are reading (read) an interesting story book now.否定句形式：
