when to use ago and before ?

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https://byjus.com/english/difference-between-ago-and-before

https://byjus.com/english/difference-between-ago-and-before
Difference between Ago and Before | Ago vs Before – BYJU’S
The word ‘before’ is used as an adverb in this example. Examples of Ago and Before The following examples will help students understand the terms ‘ago’ and ‘before’ better: Ago – Long time ago, there lived a king who ruled this land. Before – Sam left minutes before Andrew came in.

https://dictionary.cambridge.org/grammar/british-grammar/ago

https://dictionary.cambridge.org/grammar/british-grammar/ago
Ago – Grammar – Cambridge Dictionary
Warning: We normally use ago with the past simple. We don’t use it with the present perfect: I received his letter four days ago. Not: I have received his letter four days ago. If we refer to a point in time before a specific time in the past, we use before or earlier or previously, often with the past perfect:

https://www.engram.us / vs / 77 / ago-vs-before

https://www.engram.us / vs / 77 / ago-vs-before
Ago vs. Before: What’s the Difference? – Engram
Jun 11, 2023Engram The difference between ago and before Ago is an adverb, while before can be an adverb, conjunction, or preposition. Both can refer to the past, but before can also mean the present or future when referring to something that precedes a point in time in the later future.

https://ell.stackexchange.com/questions/298656/earlier-before-ago-which-to-choose

https://ell.stackexchange.com/questions/298656/earlier-before-ago-which-to-choose
word choice – earlier/before/ago, which to choose? – English Language …
1 Answer Sorted by: 2 Another way to express this is: ago is always used in relation to the present time. He left six months ago. [in relation to today] He left six months earlier. [in relation to some time in the past].

https://www.dailywritingtips.com/before-and-ago

https://www.dailywritingtips.com/before-and-ago
Before and Ago – DAILY WRITING TIPS
ago – at a certain time before, counting back from the present Another way of writing the above sentence would be to make use of a perfect tense: [a man] passes away and bequeaths his shack on the island to a woman, a young girl that he had met many years before when he was in a prisoner of war hospital.

https://ell.stackexchange.com/questions/128533/difference-between-ago-and-before

https://ell.stackexchange.com/questions/128533/difference-between-ago-and-before
word usage – difference between Ago and Before – English Language …
Ago measures a length of time into the past from now (the present). At ten o’clock, an hour ago was nine o’clock. A year ago is (approximately) 365 days previously. In quoted speech ago is used to refer to a length of time prior to the speech: In 2010 he said, I gave up smoking three years ago.

https://www.espressoenglish.net/difference-between-ago-back-and-before

https://www.espressoenglish.net/difference-between-ago-back-and-before
Difference between AGO, BACK, and BEFORE – Espresso English
(informal – five years in the past from today) Before and earlier are used for past times from another time in the past. Here are some examples: Yesterday I missed my train. I got to the train station at 7:10, but the train had left ten minutes before. (or ten minutes earlier) (= at 7:00, ten minutes before 7:10 yesterday)

https://learntalk.org/en/blog/talking-about-time-ago-back-before-and-earlier

https://learntalk.org/en/blog/talking-about-time-ago-back-before-and-earlier
Learntalk | Talking About Time: Ago, Back, Before, and Earlier
EARLIER You also use earlier in the same way. It’s a little more formal than before. Examples: • I passed by your office earlier. I was at your building for a meeting. • He worked for The New York Times five years earlier. • She arrived at the station at 6:30 am, but the train had left 10 minutes earlier. Practice using these words.

https://langeek.co/en/grammar/course/1096/before-vs-ago

https://langeek.co/en/grammar/course/1096/before-vs-ago
Before vs. Ago in the English Grammar | LanGeek
We use before to indicate doing something prior to another whereas, we use ‘ago’ to refer to past times. Differences ‘Before’ can function as both an adverb, a preposition, and a subordinating conjunction. When it is a preposition of time, it shows an action is taking place before another.

https://dictionary.cambridge.org/grammar/british-grammar/before

https://dictionary.cambridge.org/grammar/british-grammar/before
Before – Grammar – Cambridge Dictionary
Before – English Grammar Today – a reference to written and spoken English grammar and usage – Cambridge Dictionary lesoutrali bot