How do you respond to "Thank you" and "sorry"? How do you respond to "Thank you"/"Sorry"? Maybe "No problem"/ "You are welcome" /"Not at all"/ "My pleasure" /"Don't mention it" for "thank you"? "That's okay/Don't worry about it"/"No worries"/or again "No problem" for "sorry" ? What are the nuances between different responses? Under what context would you use them? I think about this question because of two real life cases: 1. I worked as a TA for a course, and assisted in uploading reading materials etc., students constantly say “thank you” to me, but I am tired of always replying "no problem", I think I need a variety of word choices, but I was wondering whether "you are welcome" may appear too formal,and "don't mention it" may be rarely used. 2. Someone stepped on me and said "sorry" to me, I replied "no..." because I forgot how to respond to "sorry" in English. haha. Thank you!