1. "Do not bother" is not a completely formal expression, hence I wouldn't use it while communicating with people such as my boss. You can use it with clients though, …
Do not bother yourself to ask the professor, because you know the answer. (2). Do not bother the professor because he won't tell you the answer. Your interpretation (1) …
OP's bug is informal/slangy, and shouldn't be used unless you know the other party very well, but in most other contexts it should be fine to say "Sorry to trouble (or …
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Patron [shaking head to mean no]: That's okay. Waitress: Here's the check then, hun. In other words, the patron is really trying to say, "That's okay, but I am already full." …
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