YOU SAID:

we have to put up the Christmas tree

INTO JAPANESE

私たちはクリスマスツリーを立てる必要があります

BACK INTO ENGLISH

We need to set up a Christmas tree

INTO JAPANESE

クリスマスツリーを作る必要があります

BACK INTO ENGLISH

I need to make a Christmas tree

INTO JAPANESE

私はクリスマスツリーを作る必要があります

BACK INTO ENGLISH

I need to make a Christmas tree