because - when the action have the reason
so that - when the action have the the cause
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
I had to repaint my picture because it was so sloppy.
He won't date her because he is so pygmalion.
the judge explained that because his offence was so serious,his prison sentence was protracted.
that girl is so malicious because everyday she bullies kids.
all commercials are so boring because I think they have no point
They use them because their sentence is continuing or their thinking about what to write next or just because the sentence or story is just to long so they only give you the important parts.
No you can not because you are making a list and so what the topic is who use what happened the most and trun it into a sentence.
Soft ball is so humdrum because there is no point in catching the ball.
the boy was so drowsy because his math class was boring
Because the book was so poorly written most copies were unsold.
I just want to punch you so badly, because of what you did to my friend.