Japanese dictionary & Nihongo study tool.
The Japanese grammar content is from jgram.org licensed CC BY-SA 2.0.

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ことにする
koto ni suru
Edit  ドラコ1416
ことになる
Meaning
(I/you/he/she/we/they) has/have decided that...
I have decided that I'll do the test.
Edit  ドラコ1416
Formation
Phrases
たばこをとめることにしました。
I have decided to quit smoking.
Edit  #8544 ドラコ1416
Discussion and comments
http://jgram.org/pages/viewOne.php?tagE=kotonisuru aren't they the same?
monol0g
Yes, they are the same, but I can't change it... maybe some 'moderator' could take a look...
karekano