这句英文中的prior to 是否可以换做until?

这句英文中的prior to 是否可以换做until? 句中的as,可以换做when或while吗? prior four 原句“tried to find a job within the prior four week He did not do to bed until his mother came back .可以将came换wen subject to prior sale until在句中的用法 How do you get from New York to Beijing?句中的from New York是否可以 这句定语从句中的which 可以换为that吗 This is the house which is for sale.这句话中的which 是否可以换为that reach completion中的reach可以换作come to?arrive 这句英文中的“of”做什么成分, 请问下面这句英语of在句中的作用是什么,去掉of是否可以