here is a question in lesson 85 in new concept english volume 1

问题描述:

here is a question in lesson 85 in new concept english volume 1
have you ever been there,Helen?
yes,i have.i was there in June
我想请问的是WAS后面可以省掉或就是没有介词吗?比方说 我六月在日本的I WAS IN JAPAN IN JUNE,应该有的呀

there是副词,副词前面不能有介词.
Japan是名词,前面肯定要用介词连接.
介词可以做表语,所以was后可以直接接.