日本語道場
Nihongo Dojo — N3 → N2
N3
~ことに
~koto ni
to my (surprise/regret)...
When to use it
Use ~ことに to front-load the speaker's emotional evaluation before stating the fact itself — "to my regret, ...", "surprisingly, ...". It is a written/formal framing device common in reports, minutes and business email, where it signals your stance toward news before delivering it. Only a closed set of emotion words works (残念な, 驚いた, 幸い, ありがたい, 困った, 嬉しい, 意外な); it cannot take arbitrary adjectives.
Formation
Examples
Regrettably, we have decided to pass on your proposal this time.
To our surprise, a competitor announced the same feature first.
Thankfully, the client placed an additional order with us.
Unfortunately, it seems approval won't come through this month.
Fortunately, there has been no impact on the delivery date.