open变延续性动词为什么变成be open,而不是be opened

为什么open变为延续性动词时要变成have been open 而不变成have been opened? 请帮我把几个非延续性动词变成延续性动词 come leave open close buy borrow/lend be be open和 opened区别 be open 与be opened 区别? be opened和open用法初中英语 open变延续性动词是have been open还是have been opened?总觉得两个都行如果两个都行,那有 Open to,open for,be opened to,be opened for 意思和用 be open to 和 be opened to 可以替换吗 be open与be opened的区别是什么啊 be open can be opened和will open有什么区别 open和finish的延续性动词