look through somebody/something (phrasal verb)
to not notice or pretend not to notice someone you know, even though you see them
look through sb
to not notice someone that you know, or to pretend that you have not noticed someone, even though you are looking directly at them
Why use "to not V"? Why not use "not to V"?
What's the difference in meaning or style between the above two structures?
Thank you very much for your reply.