YOU SAID:

I beat him while playing football.

INTO JAPANESE

私はサッカーをしながら彼を倒します。

BACK INTO ENGLISH

I lay him while playing football.

INTO JAPANESE

私は彼のサッカーをしながら横たわっていた。

BACK INTO ENGLISH

I was lying with his football.

INTO JAPANESE

私は、彼のサッカーで横たわっていた。

BACK INTO ENGLISH

I was lying in his football.

INTO JAPANESE

私は、彼のサッカーに横たわっていた。

BACK INTO ENGLISH

I was lying on his football.

INTO JAPANESE

私は、彼のサッカーに横たわっていた。

BACK INTO ENGLISH

I was lying on his football.