The dog's running across the grass.狗在草地上跑,为什么要加across?3Q

Look at the dog.It's (chasing) a cat.A.running after B.running behind C.running The dog's running across the grass.It's running after a cat.这句话里的 across The cat is running after the dog. the dog is running a_____ the grasskuai They running after the dog修改病句 the dog is running toits m____ 改为陈述句 Is the dog running? The dog's running across the grass.狗在草地上跑,为什么要加across?3Q after,the,running,boy,is,the,dog连词成句 介词填空：The dog is running __ the grass after,the,running,boy,is,the,dog.连词成句. 将下列句子排序 Now the mouse is dancing.The mouse is eating the dog's food.The dog is crying and Now the mouse is dancing.The mouse is eating the dog's food.The dog is crying and the mouse is laughing.the dog is running after the mouse.(排序 连词成句 the running is ofter the dog mous连词成句 the running is ofter the dog mouse? Don't running after the dog错在什么地方 What about the dog?这句话没看见谓语啊简单句5大结构,但是这句话没看见谓语新概念英语册31课EAN：What about the dog?JACK：The dog's is the garden,too.It's running across the grass.It's running after a cat.---------------- My dog's subject is only running around with me.为什么用running而不用run which running dog is yours 和is the dog which is running yours ?哪个语法正确?why ? i see a dog running across the field.中请问running是动名词还是现在分词?