Are you looking for something? or Are you looking for anything? Scenario: I was searching my keys and made the room very messy. Then my girlfriend came in and (a little angrily) asked me: Are you looking for ****thing? SOME or ANY? Just in case it's "something": In horror movies, people ask "are you feeling/hearing/seeing anything?". Then why 'anything' is this case? What's the difference to the "are you looking for something?"

How to say 大不了 in English 举个例子： 别担心，大不了我们从头再来。 Don't worry, we could restart it anyway? After all? Which one is better? Is there any better translation? Thanks.

What does "on the fly" mean? I found this on a website: " Deleted my answer, which was similar in thought process but designed on the fly (and hence needed to implement various other functions). " Does it mean not realistic? Thanks.

How to say "it's nice to KNOW you"? I heard people saying "it's nice to meet/see you (here)" or stuff similar to that. But what if I just meet somebody for the first time, and feel very happy to know this person? Example (A conversation on Whatsapp or facebook after Jo has given a talk): -Joe: Hi, the talk you gave this morning was very interesting! The ***** you mentioned really inspired me! -Jo: Thank you, I am glad you found it helpful. -Joe: My name is Joe, by the way. I am also working on the same topic as you! -Jo: Nice to (????) you! Perhaps we can work with each other in the future. Does it make sense to say "It's nice to KNOW you"? (It actually does not sound like English to me). Thanks.