Student or Learner
usage of with
Welcome to the forum, Laxmi.
Please note that your title should bear some relationship to your queation. "With" would have been an acceptable title; "doubt" is not.
The first thing I would suggest is that you look up the word "with" in a dictionary. OneLook Dictionary Search is an excellent online resource. If you then have more specific questions about how the word is used, post them and we will try to help.