〜Vる / N + はずだった

Pattern
〜Vる / N + はずだった
Level
N4
Reading
はずだった
Meaning
Was supposed to ~ (but didn't)
Attaches to
Verb (dictionary form / ta-form), Noun + の, い-adjective, な-adjective + な
Nuance & register

Expresses an expectation, plan, or certainty from the past that ultimately did not happen, often implying regret, disappointment, or surprise.

Example

今日は晴れるはずだったのに、雨だ。

Easily confused with

「〜つもりだった」 (personal intention that was not realized) vs. 「〜はずだった」 (an expectation or plan, often external, that did not come to fruition, implying surprise or regret).

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