Question

ねこ

(至急)私はもっと良い方法があったはずだと思うだろう
は
I would think there were other good ways.

で良いと思いますか、？

Answer 1

taka

△I would think there were other good ways. → 〇I would think there should have been some better ways.　
※should＋動詞の完了形(have ～ed(過去分詞)) ～するべきだった(のに、しなかった)

参考にしてください。