ago
/əˈgəu; ə`ɡo/ adv
(used after the word or phrase it modifies, esp with the simple past tense, not with the perfect tense 用於其所修饰的词语之後, 尤与简单过去时态连用而不与完成时态连用) gone by; in the past 前; 以前: ten years ago 十年前
not long ago 不久以前
It happened a few minutes ago. 那是几分钟以前发生的事.
How long ago is it that you last saw her? 你上一次看见她是多久以前的事?
It was seven years ago that my brother died. 我哥哥是七年前死的. =>Usage at recent 用法见recent.