[Kosoado (Demonstrative)] Use for intangible things: Meaning and Example Sentences

Ko-so-a-do (demonstrative) words can be used for not only tangible things but also intangible things like actions or events.
In conversation or writing, Ko-so-a-do words are often used to refer to previously mentioned information, providing coherence and avoiding repetition.
The choice of "こ," "そ," and "あ" is determined by the spatial distance between sentences, temporal distance, and the speaker's psychological distance.

パスポートをなくしました。ーそれは大(たい)変(へん)ですね。

I lost my passport. - That's terrible.
来(らい)月(げつ)、結(けっ)婚(こん)します。ーそれはおめでとうございます。

I'm getting married next month. - Congratulations on that.
去(きょ)年(ねん)、地(じ)震(しん)がありましたよね。ーええ。あれはひどかったです。

There was an earthquake last year, right? - Yes, it was terrible.
熱(ねつ)があるなら、休(やす)んだほうがいいですよ。ーそうします。

If you have a fever, you'd better rest. - I will.
花(はな)火(び)大(たい)会(かい)は、彼(かの)女(じょ)と二(ふた)人(り)で見(み)ました。このとき、彼(かの)女(じょ)に「好(す)きだ」と言(い)ったんです。

I watched the fireworks festival with her. That's when I told her "I like you."