英语一般过去时的标志性词语表示间的：last night...; yesterday; two hours ago; three years later; after a week.... 一般将来时的表示性词语tomorrow; next year/ week...; in half an hour, in 2020 现在完成时的表示性词语 already, yet; ever; never; just; before; since....; for....; so far; in the past/ last few years。