MNN S2 Grammar

どうして　会社を　休んだんですか。

Why did you give up on the company job?

(Question word +) when asking for the explanation, reason or cause of something we have seen/heard about

私は　うんどうかいに　さんかしません。ようじが　あるんです。

I am not attending the sports festival. I have some work to do.

When stating the reason or cause as an answer/excuse/explanation (to a question or not).

新しい　パソコンを　買ったんですか。

Did you buy a new PC?

when guessing the reason or cause as to what we have seen/heard

書き方が　わからないんですが、教えていただけませんか。

I don't know the way of writing this so, wouldn't you be so kind as to teaching me?

request politer than ～て　ください。

大学へ　行きたいんですが、どこで　降りたら いいですか。

I want to go the university so, where shall I get off?

asking for advice or instructions on what to do