YOU SAID:

How these things work, I do not know.

INTO JAPANESE

開くはずだが

BACK INTO ENGLISH

You should open it

INTO JAPANESE

あなたはそれを開く必要があります。

BACK INTO ENGLISH

You need to open it.

INTO JAPANESE

それを開く必要があります。

BACK INTO ENGLISH

It is necessary to open it.

INTO JAPANESE

それは必要だ。

BACK INTO ENGLISH

It is necessary.

INTO JAPANESE

それは必要だ。

BACK INTO ENGLISH

It is necessary.