一、这一组,只要记住“昨天”,其它联想就很好记!
yesterday,
the day before yesterday
yesterday evening
last night
last+时间(last week , last month, last year)
二、这一组,只要记住“刚才”,其它联想就很好记!
just now=a moment ago
“段时间+ago”表示“……前”比如“三天前”就是“three days ago”
三、这一组,是考试常考的,需要特别记忆!
this morning
when I was five years old,
in +过去时间词(in 1998)
Ago（two hours ago（一段时间+ago）, yesterday(句子开头或结尾）, the day before yesterday, last week,last(year, night, month…), 具体时间（如Jan.fourth), just now, at the age of , one day, long ago, once upon a time(很久以前), and so on,this morning.long long ago.