一般过去时时间状语

just now刚才，once曾经，yeaterday昨天,last night昨夜，the day before yesterday前天，several days ago几天前，a year ago一年前，a week ago一周前，many years ago,很多年前，longlong ago很久很久以前

last year,last night,yesterday,last week......

主要有yesterday,last week,two years ago,和在几几年4种
还有when,before,after,until等引导的时间状语从句中