from abroad,as usual,go home,on one's way home

问题描述:

from abroad,as usual,go home,on one's way home
from abroad:
abroad不是副词吗,为什么from后面可以跟副词呢?
as usual:
usual是形容词,为什么可以跟在as后呢?从意思上也不对啊;
go home / on one's way home:
home可以做名词,那为什么不可以说go to home呢?或者on one's way to home呢?

abroad可以做名词 名词 n.1.(用在from后)异国,海外[U]They just returned from abroad.他们刚从国外回来.usual 形容词 a.1.通常的,平常的;惯常的He came home later than usual.他回家比平时迟.Shall we meet at the...as usual像平常一样,如果说一下或者用一下这个词组,我也觉得很顺口,因为用的很多。但是从语法的角度想下,就觉得奇怪了:像...一样 中间应该是名词啊,就像“想平常一样”,“平常”应该是名词啊。如果中间是形容词,就感觉很怪。