I have not seen him for several weeks.
Is it possible to use 'during' instead of 'for'? Why?
anonymous Is it possible to use 'during' instead of 'for'? No.
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anonymousWhy?
During must have a start and end time. "Several weeks" does not express a start and end time. A past completed event requires the simple past tense, not the present perfect.
I did not see him during August and September.