YOU SAID:

could you please pass the butter?

INTO JAPANESE

バターを回して下さいませんか。

BACK INTO ENGLISH

Could you pass me the butter?

INTO JAPANESE

バターをくださいませんか。

BACK INTO ENGLISH

Give me the butter.

INTO JAPANESE

私はバターを与えます。

BACK INTO ENGLISH

I give butter.

INTO JAPANESE

私はバターを与えます。

BACK INTO ENGLISH

I give butter.