x days ago
fixed phr..fixed phr.. This phrase tells you when something happened in the past. You use a number for 'X' to say how many days before today it was.
fixed phr.. A time adverbial phrase used to specify a point in the past, calculated by counting back a certain number of time units from the present moment. It requires the simple past tense.
I saw him three days ago.
She started her new job just a few days ago, so she is still learning everything.
The policy was enacted ten days ago, yet its full ramifications are only now becoming apparent to the public.
This phrase is always used with the simple past tense, not the present perfect.
Contrast 'X days ago' (a specific point in the past, requiring simple past) with 'for X days' (a duration, often used with present perfect).
I have seen him three days ago.I saw him three days ago.The adverb 'ago' refers to a finished point in the past and must be used with the simple past tense.