Question

I did not see him since last January.error correction

Answer 1

Hey !!!

The correct sentence should be :

I have not seen him since last January....

Answer 2

$\small{HEYAAMATEYY!!!{$

⇒ I haven't seen him since last January.

because,,,

'since' is used only in perfect tenses

and 'from' can be used in any tense..

$\large{hopeyougotit!!}$

$\large{BEBRAINLY!!!}$