"I've been to the museum." 是现在完成时,意思是 “我去过博物馆”。
如果变成 "I am to the museum." 或 I was to the museum 则分别表示 “我要去博物馆” 和 “我曾安排要去博物馆”,意思发生了变化,这不能算作还原。
一般现在时:I go to the museum.
一般过去时:I went to the museum.
现在完成时:I've been to the museum.
谢谢!
I go to the ……
I went to the ……