YOU SAID:

we would leave the christmas up until january

INTO JAPANESE

私たちはクリスマスを1月まで放置するだろう

BACK INTO ENGLISH

we will leave Christmas until January

INTO JAPANESE

私たちは1月までクリスマスを過ごします

BACK INTO ENGLISH

We'll be spending Christmas until January.

INTO JAPANESE

1月までクリスマスを過ごします。

BACK INTO ENGLISH

We will be spending Christmas until January.

INTO JAPANESE

私たちは１月までクリスマスを過ごすことになる。

BACK INTO ENGLISH

We are going to spend Christmas until January.

INTO JAPANESE

私たちは１月までクリスマスを過ごすつもりです。

BACK INTO ENGLISH

We are going to spend Christmas until January.