before now, in the past
"two years ago"
"`agone' is an archaic word for `ago'"
"sixty years ago my grandfather came to the U.S."
He's drunk,..an hour agone.
出自：Twelfth Night , Shakespeare
Ay, a goodish bit ago.
A slight landslide occurred../ about an hour ago.
出自： E. Bishop
She must have seen him a week ago.
She seems to have seen him a week ago.
I have long ago given up that habit.
He started five minutes ago.
He told me he had seen her a few minutes before.
When you call at the shop again this afternoon, you may be told that the book has been sold only a few minutes before.
He often forgets what he has heard only a few minutes before.
He died 20years ago.(不带从句）
It was 20 years ago that he died.(带从句)
误 And I visited her the next day ago.
正 And I visited her the next day.
误 It has been happening since three years ago.
正 It happened three years ago.
误 The accident happened at ten years ago.
正 The accident happened ten years ago.