Student or Learner
Sue opened the door carefully trying not to make a noise.
Is it possible to omit "a" without changing the meaning of the sentence? Why is the article even used there?
Please, correct all my mistakes. I should know English perfectly and if you show me my mistakes I will achieve my dream a little bit faster. A lot of thanks.
Not a teacher nor a native speaker.
The meaning changes slightly if you omit the article. Trying not to make noise means the general case of trying to remain silent. Trying not to make a noise means avoiding making a sound which could be named, such as the squeak of a hinge.
I am not a teacher.