yesterday (morning,afternoon,evening)
the day before yesterday
last night (week,Sunday,weekend,month,winter,year,century 世纪)
ago
this morning/afternoon/evening
when引导的状语从句(动词过去时)
just now
the other day -- a few days ago.
at the age of 10 (过去年龄段)
in the old days
at that time
in the+整十数年份+s(⋯世纪⋯年代)
used to do... (过去做...)
“了”