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筈だ

should be; is expected to be

→ 筈
phrase Very common #553
should be; is expected to be Usually written in hiragana as はずだ. It expresses an expectation, assumption, or conclusion based on available information or reasoning. It can follow verbs, adjectives, and nouns (typically with の).
JA: 彼はもう家に着いた筈だ。
EN: He should have arrived home already.

話を聞いたのだから興味がある筈だ。

You heard about it, so you must be interested.

気付いている筈だ

You must have noticed.

— The Garden of Sinners: Paradox Spiral (2008)

アドルフ・ヒトラー言った筈だ！

Adolf Hitler said it—I’m sure of it!

— 帰ってきたヒトラー (2015)

ではとても眠い筈だとても疲れている

Then you must be very sleepy and very tired.

— ラスト、コーション (2007)

こうなる事は分かっていた筈だ！

I should have known this would happen!

— ラスト、コーション (2007)

おまえは死んだ筈だ!

You were supposed to be dead!

— The Garden of Sinners: Paradox Spiral (2008)

窃盗でマンダンを追放した筈だ

They were supposed to have banished Mandan for theft.

— コーラス (2004)