YOU SAID:

all you need to do is think

INTO JAPANESE

すべてを行う必要があるです。

BACK INTO ENGLISH

There is need to do everything it is.

INTO JAPANESE

それは、すべてを行う必要があります。

BACK INTO ENGLISH

You must do it all.

INTO JAPANESE

それがすべてを行う必要があります。

BACK INTO ENGLISH

You must do it all.