Hello, teachers
Mr @David, Moderator and Mr @Gustavo, Co-Moderator
Is it OK to use either "mustn't" or "needn't" in such a context?
Writing this report is not important. You[ mustn't _ needn't ] bother yourself.
I came across some sentences using "mustn't / needn't worry". I think "bother" has the same meaning and can be used the same way with both modal verbs.
I know "mustn't" refers to something that is prohibited / negative obligation. However, "needn't" refers to "lack of necessity". Yet, Can't we use "mustn't" for "strong advice" as is mentioned in some sentences.