YOU SAID:

They always come, in case they're needed.

INTO JAPANESE

彼らは必要とされた場合に備えて常に来ます。

BACK INTO ENGLISH

They always come in case they are needed.

INTO JAPANESE

彼らは常に彼らが必要とされているために来ます。

BACK INTO ENGLISH

They always come for they are needed.

INTO JAPANESE

彼らは常に必要なためにやって来ます。

BACK INTO ENGLISH

They always come for necessity.

INTO JAPANESE

彼らはいつも必需品のためにやって来ます。

BACK INTO ENGLISH

They always come for necessities.

INTO JAPANESE

彼らは常に必需品の来る。

BACK INTO ENGLISH

They always come for necessities.