YOU SAID:

Should've would've could've

INTO JAPANESE

できるはずだっただろうか？

BACK INTO ENGLISH

Were they supposed to be able to do?

INTO JAPANESE

彼らはできなければならなかったのだろうか？

BACK INTO ENGLISH

Did they have to be able to do?

INTO JAPANESE

彼らはできる必要がありますか？

BACK INTO ENGLISH

Do they need to be able?

INTO JAPANESE

彼らは能力が必要ですか？

BACK INTO ENGLISH

Do they need ability?

INTO JAPANESE

彼らは能力が必要ですか？

BACK INTO ENGLISH

Do they need ability?