This phrase means you are very sure about something. You think it must be true. It is like saying 'it's definitely true' or 'it has to be'.
Verb [dictionary form] + に決まっているPrimary
い-Adjective + に決まっている
な-Adjective + に決まっている
Noun + に決まっている
This phrase means you are very sure about something. You think it must be true. It is like saying 'it's definitely true' or 'it has to be'.
あの人気歌手のコンサートだから、チケットはすぐに売り切れるに決まっている。
Since it's that popular singer's concert, the tickets are sure to sell out immediately.
全然勉強しないんだから、試験に合格できないに決まっている。
Since they don't study at all, it's certain they won't be able to pass the exam.
あんなに練習したんだから、彼が勝つに決まっていたよ。
He practiced so much, so it was certain he was going to win.
真冬の北海道は、寒いに決まっている。
Hokkaido in the middle of winter is bound to be cold.
嘘をつくに決まっている人物を信用してはいけない。
You shouldn't trust a person who is bound to lie.
This phrase shows you are very sure. You believe something is true. It can sound strong. Sometimes it might sound like you are not listening to others. Use it when you are very certain. Or when something seems very clear to you.
This phrase is like saying "it's obvious!" It is stronger than "~hazu da" or "~ni chigai nai." "~Hazu da" means you expect something logically. "~Ni chigai nai" means you strongly guess something. This phrase shows your strong feelings. It is not for formal talks.
Use this when you want to say something is very true. You can also use it to stop an argument. It means the other idea is not good. You are very sure about what you say.
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