〜ことになっている
To be expected to/to be scheduled to/it has been decided as a rule that ~
About
~ことになっている attaches to casual form present tense verbs as well as ~てもいい constructs.
~ことになっている is used for rules, customs, decisions, and things that are generally understood to be the case.
~ことになっている often does not appear in translation, but may sometimes be approximated as "should do X/have to X/are expected to X/won't do X".
E.g. うちでは、料理を作らなかった人が食器を洗うことになっている。 "In our house, whoever doesn't cook washes the dishes."
E.g. この薬は、1日2回飲むことになっています。 "This medicine should be taken twice a day."
E.g. 土曜日は従姉妹の引っ越しを手伝うことになっているから、遊べない。 "I can't hang out on the weekend because I'm supposed to help my cousin move."
~ことになっている should describe things that are decided to be a certain way by someone other than the speaker. ~ことにしている can be used for personal decisions.
~ことになっている can also create "supposed to be X" statements that describe a lie or a false context that has been externally agreed upon or established.
E.g. 親戚の間では、私はお金持ちで社長をしていることになってる。 "Among my relatives, I'm (supposedly) a rich CEO. (This isn't actually the case.)"
~ことになっている attaches to casual form present tense verbs as well as ~てもいい constructs
~ことになっている is used for rules, customs, decisions, and things that are generally understood to be the case
~ことになっている often does not appear in translation, but may sometimes be approximated as "should do X/have to X/are expected to X/won't do X"
~ことになっている can also create "supposed to be X" statements that describe a lie or a false context that has been externally agreed upon or established
Summary
Explained in
Example Sentences
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