I'm trying to figure out what this grammar is used for...
My textbook presents this:
b) 〜だけでは 〜ない
c) 〜だけじゃ 〜ない
I believe a) is just saying "by simply doing something/having something etc ~ I was able to do something..."
I believe b) is just saying "by simply being/doing something you can't also do/become/have something else"
I then have no idea what c) is trying to say. I don't know if it means by doing something you can also have something or if you do something you can't also have something else or what.... Please help!