---Be careful!there is a doglying on the ground 这句话中为什么冠词要用a

---Be careful!there is a doglying on the ground 这句话中为什么冠词要用a There's ( )snow on the ground .Please be careful.A.any B.sev There is a bag on the ground.Whose is it? Be careful,There is a wine b___ on the table.You might break ---There is a book ________ on the ground. Look!There is a pen __(lie) on the ground. There is a purse ___（lie）on the ground. Look,there is a dog_(lie)on the ground. There is a house _____（work） on the ground. The ground is wet.__not to fall.A Be careful B Take care C T -Hey!there is a bag on the ground.___ is it? -There's a woma on the ground lay a boy与there is a boy lay on the ground 的区别