1.就近原则 e.g.There is a book,two pens and some pencils on the desk.
2.用于一般(过去）将来时中 e.g.There is going to be/will be a football match in our school tomorrow afternoon.
3.用于进行时中 e.g.Look!There are many children running on the playground.
1.就近原则 e.g.There is a book,two pens and some pencils on the desk.
2.用于一般(过去）将来时中 e.g.There is going to be/will be a football match in our school tomorrow afternoon.
3.用于进行时中 e.g.Look!There are many children running on the playground.