I shook him with the shoulder, and there was still no response.

英訳に間違いが有れば正してください。

私は彼の肩を揺さぶったが、まだ反応はなかった。
I shook him with the shoulder, and there was still no response.

ヒント
肩を揺さぶった

答え withをbyにする

I shook him by the shoulder, and there was still no response.

shake+目的語+by~
目的語の~を揺さぶる