with为什么要在这里用？这是什么句型？

with后面部分起伴随的作用,是状语

呵呵 这里的with是using something or by means of something的意思
▪ Chop the onions with a sharp knife.
▪ What will you buy with the money?
▪ I amused myself with crossword puzzles.
▪ a hat decorated with brightly coloured feathers
算介词吧

介宾短语作状语
with在这里是做介宾短语的介词