How to reply when someone said 'Do you mind if I sit here'? If I replied 'yes', I may imply 'I do mind' or 'Yes, you can sit here'. If I replied 'no', I may mean 'I don't mind' or 'No you can't sit here'. So the response could have opposite meaning. I think replying 'No' should be grammatically correct. But I'd like to know how do native speakers response.

What's the difference between 'based on' and 'based off'? Recently I saw someone use 'based off of' in his article. Is it same as 'based on'? If not, when should I use 'based off' or 'based off of'?

How to translate “颠覆” in English? I don't know which word can accurately represent the meaning of “颠覆”. For example, 量子力学颠覆了人们对常识的认知 Quantum Mechanic _____ people's general knowledge of the world. or His recent behaviours _____ my impression of him. I think 'change' is too tender and can't express the strong feeling. So what should I use?

How to use 'scope' when it means 'opportunity' 'After a decade of rapid adoption, there is much less scope to sell handsets to first-time buyers as so few of them are left.' I think 'scope' here can be translated as opportunity. But I don't know where to use the word? Can I just replace 'opportunity' with 'scope'?

How to make acknowledgements after a presentation? I'll give my first scientific presentation in English but I don't know how to make the acknowledgements more native. I will thank my PI, my fellow, my group members, the funders and organizer. It is weird if I just say 'thank A for ..., thank B for..., thank C for... So I wonder if you could give me advices or some samples. You can use A, B, C as names. Thanks a lot!

What does interest mean in this phrase : person of interest I know the basic meaning of interest. But I still confused when saw it in some literatures, especially in academic papers. Does it mean sth. that people want to find? So person of interest means the person who is wanted by the police?

Hi, I'd like to find a partner to learn English and I can teach you Chinese! Hi, I'd like to find a partner to learn English and I can teach you Chinese!