はずの

supposed to

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phrase Rare #26,392
supposed to Used before a noun to describe something that is expected or believed to be true. It can also express surprise or contradiction when reality differs from that expectation, as in "someone who was supposed to be dead."
JA: 来るはずの人がまだ来ていない。
EN: The person who is supposed to come still hasn't arrived.

届くはずの荷物が届かない

The package that was supposed to arrive hasn’t arrived.

死んだはずのコウロク向こう岸に出た.

Kōroku, who was supposed to be dead, showed up on the other bank.

— もののけ姫 (1997)

-ここで感じるいつでも感じられるはずの幸せ

The happiness you feel here and now—the happiness you should always be able to feel

— ベルリン・天使の詩 (1987)

学校にいるはずのお前がなぜこんな所にいるんだ

Why are you here when you’re supposed to be at school?

駅に迎えに来るはずの弟の姿が見えなかった

I couldn't see my younger brother, who was supposed to come pick me up at the station.