English, though not exactly on the same context level as Chinese, can still present problematic nuances to second-language learners, even advanced ones. Consider the following possible affirmative responses (said in a fairly neutral voice) to the rather nerve-wracking request “Would you like to go out with me on Friday? To see that show? I hear it’s good”:
response using “Ok”
1. Ok!
2. Oh, Ok.
3. Oh, that’s Ok.
response using “right” and “yeah”
1. Yeah, right on.
2. Right. Yeah.
3. Yeah, right.
response using “sure”
1. Sure!
2. Ok… sure.
3: I’m sure.
Obviously, 1 means yes, 2 means a far less enthusiastic yes, and 3 means no. Any other questions?
Botkin Creative 
Clever!
Oh.. Clever, Girl.
You think you’re clever.
Actually you are clever.
Linguistics professor to class: “Interestingly, in many languages a double negative can have a positive meaning, but a double positive never has a negative meaning.”
Student: “Yeah, right.”