YOU SAID:

And if one brown teddy should accidentally fall, there'd be no brown teddies sitting there at all.

INTO JAPANESE

茶色いテディが落ちたらそこに座っている茶色いテディはいないでしょう

BACK INTO ENGLISH

If a brown teddy falls, no one will be sitting there.

INTO JAPANESE

茶色いテディが落ちたら誰も座らない

BACK INTO ENGLISH

If the brown teddy falls, no one sits down.

INTO JAPANESE

茶色いテディが落ちたら、誰も座らない。

BACK INTO ENGLISH

If the brown teddy falls, no one sits down.