as is often the

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as is often the

这是常有的事.
as/which is often the case (with) ...
此句型意为"…是常有的情形".这是当的 as 以全体当先行词的

这是常有的事。
情况常常如此

事常如是

在句首它就是插入语:As is often the case, Mary comes here in her car. Mary开车来这里,这是常常发生的事情.
在句尾,把as换成which,就成了定语从句:
Mary comes here in her car, which is often the case.

你这个说法其实是后面那个As it often the case对的前面那个错的,没有这个说法的