Check the brief grammar notes and examples below for your review.
Grammar Note
⚫️ Plain-form はずです
meaning : should be
It is used when you are pretty sure. You think it is obvious because it is based on some facts.
もりさんは もう かいしゃに いないはずですよ。むすめさんの たんじょうびだから、はやく かえると いっていました。 mori-san [wa] mō kaisha [ni] inai-hazudesu [yo]. musume-san [no] tanjōbida-kara, haya-ku kaeru [to] itte-imashita. ( I’m pretty sure Ms.Mori is not in an office now. She said that she was going to go home earlier, because today is her daughter’s birthday. )