古い家屋が多いので花火をすると燃えるかもしれないって英語でなんて言うの？
Since there are many old houses fireworks may burn them.でいいのでしょうか。
回答
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Since there are many old houses near by the fireworks may cause them to catch fire.
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Many of the old wooden houses around here are at risk of fire from the fireworks.
1) Since there are many old houses nearby the fireworks may cause them to catch fire.
「近くに古い家がたくさんあるので花火が家に燃え移るかもしれない。」
catch fire で「引火する・火がうつる」
2) Many of the old wooden houses around here are at risk of fire from the fireworks.
「この辺りの木造家屋の多くは花火による火事の恐れがある。」
at risk of fire で「火事の恐れ」
ご参考になれば幸いです！
日本 
