语法解答

as 在此是连词，不可省略，

省略前应为：
the private schools are much more expensive as they are compared with the government-funded schools

省略了they are

as 意思是“当，在..种情况下”，在此引导从句

类似的当主从句的主语相同时省略从句的主语＋be的结构很常见

如：you should be careful when (you are )crossing the road

我觉得可以省略啊