There were so many gunfires I could smell the smoke in the air in the street.

英訳に間違いが有れば正してください。

その通りでは空気中の硝煙を嗅ぐことができるほど多くの銃撃があった。
There were so many gunfires I could smell the smoke in the air in the street.

ヒント
銃撃

答え
were so many gunfiresをwas so much gunfireにする

There was so much gunfire I could smell the smoke in the air in the street.

gunfireは不可算名詞