thanks susan! I don't have simple and continuous forms in my mother tongue, so that makes difficulties for me. I have free English lessons here, thanks again.
I have one more question, though.
Can you, please, clarify what you mean by
"After a conjunction, the simple is always used used to refer to a future completed event."
because that's exactly what was the problem here: the action is actually in progress, it's not completed. That's why I was wondering why some continuous form isn't used instead of present simple.
I think this example is a good equivalent to 'my' sentence:
"As the course progresses, you'll find you understand more."
but I don't see how the others are?