外研版六年级英语下册《He's riding his bikebut it's starting to rain》PPT教学课件，共17页。
Let' s chant
The bell is ringing.
The dog is barking.
Little Tom is crying.
But Sam knows nothing.
当你正在做某件事情的时，另一件事也发生了，我们用英语应该怎么表示呢？
现在进行时 + but + 一般现在时
主语 + be + v-ing, but 主语 + v / v-s
现在分词，又称-ing形式 ，变化规则为：
1.一般情况直接加 ing
do→doing、sing→singing
2. 去e ，再加ing
dance→dancing like→liking write→writing make→making, take→taking
3.重读辅元辅双写尾字母，再加ing
cut→cutting swim→swimming
... ... ...
关键词：《He's riding his bikebut it's starting to rain》PPT课件免费下载，.PPT格式；
