x weeks ago
fixed phr..fixed phr.. A phrase used to say when something happened in the past. You replace 'X' with a number to say how many weeks before now it was.
fixed phr.. A fixed adverbial phrase of time used to specify a point in the past, calculated by counting a number of weeks backward from the present moment.
I started my new job two weeks ago.
She moved to this city about six weeks ago and is still getting used to it.
The policy was enacted ten weeks ago, yet its tangible effects on the local economy are only now becoming apparent to analysts.
This phrase is always used with the simple past tense to refer to a finished action at a specific time.
Contrast 'ago' (counting back from now) with 'for' (describing a duration, e.g., 'I lived there for two weeks') to prevent tense confusion.
I have visited them three weeks ago.I visited them three weeks ago.The word 'ago' specifies a finished time in the past, so you must use the simple past tense, not the present perfect.