为什么as```asbefore有两个as,而asusual只有一个?

Question

为什么as```as before有两个as,而as usual只有一个?

Answer 1

as ...as before 这里的 before 只是常用词组 as ...as 后面跟的一个副词,并非固定搭配.
After recovering from his injury,he goes to the gym as often as before.
as usual 是俚语,表达“一如往常”之意,并不存在前后比较的性质.
As usual,he goes to the gym on Monday.