i have not been to shanghai.这句英语为什么要用 been

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i have not been to shanghai.这句英语为什么要用 been
have been是固定用法吗

I have not been to Shanghai.
我没去过上海.
have been是固定搭配,表示*去过某个地方,（隐含去过这个地方,而且已经回来了）
否定式就是Have not been,表示*没去过某个地方*

i have not been to shanghai.这句英语为什么要用 been i have been to shanghai为什么加been? I have been to Shanghai I have ever been to Shanghai改成否定句 I have been to Shanghai.(变否定句0 have been to shanghai I have never been to shanghai.( ) ( )she I have never been to shanghai.________? I have been to shanghai 什么时态请问一下I have been to shanghai i have been to Shanghai?和i have been Shanghai?哪个对?请详解. -Have you been to Shanghai?