Article

I have the biggest problem w/ article. Can someone point me to any link or good article written about them?

I can't tell most of the time especially when I am writing, when I should be using them. I know it comes before the noun but it's not so obvious lot of times. How do you guys handle this? or is it just more natural habit because you are native english speaker?

e.g., is it

in line

or
in a line.