Thanks for the comment jollyjohnson68,
Hard to find the right lesson for the Grammar Point!??
Stop searching for the lesson...
Okay... let's talk about the explanation, "it works & it doesn't work"
First, let's take a look at its 'literal' meaning,
"it" 그것 [geu-geot]
"work" 일하다 [il-ha-da]
Therefore, "it works" 그것이 일한다 [geu-geot-i il-han-da], which is the 'literal' translation.
However, "it works" means "something is going well as you expected"
Therefore, "it works"
그것이 된다 [geu-geot-i doen-da], which is the 'contextual' translation.
Second, let's take a look at "it doesn't work"...
"it" 그것
"doesn't" 안 [an]
"work" 일하다
Therefore, "it doesn't work" 그것이 안 일한다 [geu-geot-i an il-han-da], which is the 'literal' translation.
However, "it doesn't work" means "something is NOT going well as you expected"
Therefore, "it doesn't work" means
그것이 안 된다 [geu-geot-i an doen-da], which is the 'contextual' translation.
To sum it up,
"It works" = (그것이) 된다 [doen-da]
"it doesn't work" = (그것이) 안 된다 [an doen-da]
I hope my explanation helps you understand Korean better,
cheers,
Tim