Question

みやこんぶ

本来の問題ではないんですけど、(1)のotherwiseの後がwould haveになるのはどうしてでしょうか？
高校英語になってからずっと時制がよくわかってなくて、、出来るだけ詳しく教えてください🙇‍♀️

16 下の [
]内から適切な語を1回ずつ選び、英文を完成させなさい。 If I hadn't or
(I checked my schedule this morning; (otherwise) I would have missed the meeting.
(2) I'm lucky because my apartment is cheap. (more Over), it's close to the station.
3 I thought he would keep his word this time. (neverthele), he didn't.
(4) I didn't take notes, and (therefore) I can't remember exactly what he said.
・セミコロンと同じ
[ moreover / nevertheless otherwise / therefore ]