父は手術を受ける事になっている。
tbd
My father is going to undergo an operation.
My father is going to have an operation.
My father is going to have surgery.
My father is to undergo surgery.
Father is going to undergo an operation.
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
こと， 事， 縡
1. thing, matter
2. incident, occurrence, event, something serious, trouble, crisis
3. circumstances, situation, state of affairs
4. work, business, affair
5. after an inflectable word, creates a noun phrase indicating something the speaker does not ...
tbd