How would a native English speaker respond in this situation?
What would someone who speaks English as their first language say in this case?
ーHow would a native English speaker respond in this situation?
「この場合、ネイティブはどのように答えますか？」
a native English speaker で「英語のネイティブスピーカー」
to respond で「答える・返事をする」
ーWhat would someone who speaks English as their first language say in this case?
「この場合、英語を母語とする人は何て言いますか？」
someone who speaks English as their first language で「英語を母語・第一言語とする人」
ご参考まで！
カナダ 
