YOU SAID:

If two and three were just here, there was no one.

INTO JAPANESE

二人と三人がここにいれば誰もいなかった。

BACK INTO ENGLISH

If two or three were here, there would be no one.

INTO JAPANESE

ここに二人か三人いれば、誰もいなくなる。

BACK INTO ENGLISH

If there are two or three people here, there will be no one left.

INTO JAPANESE

ここに2、3人いれば誰もいなくなる。

BACK INTO ENGLISH

If there are two or three people here, there will be no one left.