as often as及其他
一 as often as用于字面义，表示“与……一样经常”，可视为as…as结构与often的自然搭配;若用作习语，则表示“每当”。如：
I don‘t visit my parents as often as I should. 我去看望的次数不够经常。
As often as I tried to phone him the line wasengaged. 每次我给他打电话都占线。
另外，习惯搭配as often as not的意思是“往往”“通常”，不能按字面来理解。如：
As often as not, he forgets his homework. 他常常忘做家庭作业。
二 其他的还有：
as soon as字面意思为“与……一样快”;作为习语，其意为“一……就”。
as long as字面意思为“与……一样长(久)”;作为习语，其意为“只要”。
as well as字面意思为“与……一样好”;作为习语，其意为“不但……而且”“既是……也是”“而且”“还”。
From:https://www.zgghmh.com/CET-4/20000874.asp