It is expected, according to the survey ,that housing price can not go up any more.
根據(jù)調(diào)查,預(yù)計房價不會再往上漲了.
這句話中according to the survey是插入語,起到補充說明的作用,主句是It is expected that……
類似的還有,It is well known that...那As是用什么句式呢？as可以引導(dǎo)狀語從句和定語從句，例如：
As she is a model teacher, she gives a good example to others.（as引導(dǎo)原因狀語從句）
I saw him as he was getting off the bus. （as引導(dǎo)時間狀語從句）
As is reported in the newspapers, talks between the two countries are making progress. （as引導(dǎo)定語從句）那這一句是什么句式？It is expected, according to the survey ,that housing price can not go up any more.

這是主語從句，it是形式主語，真正的主語是that引導(dǎo)的從句。