Feelings 1

It was fun!
To describe how something was in Japanese, just replace the final ‑い of the adjective with ‑かった.
その本は面白いですか?
Is that book interesting?

その本は面白かったですか?
Was that book interesting?
このパーティーは楽しいです。
This party is fun.

きのうのパーティーは楽しかったです。
The party yesterday was fun.
But why!?
To ask why in Japanese, put either どうして or なぜ (whichever you want!) after the topic and end the question with ‑んですか.
その映画はなぜ怖いんですか
Why is that movie scary?
そのテストはなぜ難しいんですか
Why is that test difficult?
どうしてつまらなかったんですか
Why was (that) boring?
You use ‑んですか with a question when you want more of an explanation, instead of just a one‑word answer.
Because I said so!
When you give a reason for something, you should put から after that reason!
面白いから日本語を勉強します。
Because (it) is interesting, (I) study Japanese.
怖かったから泣きました。
Because (it) was scary, (I) cried.