What's the difference?

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Apr 01st 2012 23:12
Today I'm not going to write a diary, but going to ask you some questions instead.


When I find two sentences which have the same meaning but are expressed in a different way, I take notes because I'm not sure what's the difference between the two. Here is the some of them.


A1. I could release the song.
B1. I could do with releasing the song.

A2. Which is yours?
B2. Which is supposed to be yours?



I don't know those differences.
I'd appreciate if you taught me how different they are.