Open to,open for,be opened to,be opened for 意思和用Open to,open for,be opened to,be opened for 意思和用法还有主语各是什么

Open to,open for,be opened to,be opened for 意思和用Open to,open for,be opened to,be opened for 意思和用法还有主语各是什么 be able to open it be open for sb还是 be open to sb?为什么那为什么我们书上写the swimming pole is open all year round for students who like swimming. be open be open OPEN FOR OPEN FOR USE it was forced open it was forced to be open OPEN open open open open open open open OPEN open open