What it means
ことか expresses a strong emotional reaction, usually surprise, admiration, regret, or emphasis about the degree of a state or action. It commonly follows a plain-form verb or adjective, often with words such as どれほど or なんと. The construction is exclamatory rather than an ordinary question, and it is especially common in written, reflective, or dramatic language.
Usage note
ことか is not normally used to ask for information. The polite counterpart ことでしょうか preserves the exclamatory meaning, but it remains formal and literary rather than conversational.
How to use it
なんと静かなことでしょうか。
How quiet it is!
どれほど難しかったことでしょうか。
How difficult it was!
どれほど待ったことでしょうか。
How long I waited!
なんと静かなことか。
How quiet it is!
どれほど難しかったことか。
How difficult it was!
どれほど待ったことか。
How long I waited!
Example sentences
初めて海外で働いた一年間が、どれほど貴重な経験だったことか。
How valuable an experience that first year working abroad was.
病気の母を支えることが、どれほど大変だったことか。
How difficult it was to support my sick mother.
長い冬を越えて咲いた桜