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 was engaged. 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”。