Was it just me or did I hear you opening a can of tuna?
Was it just my imagination or did I hear a tuna can being opened?
ーWas it just me or did I hear you opening a can of tuna?
「あなたがツナ缶を開けてる音を聞いたんだけど気のせい？」
to open a can of tuna で「ツナ缶を開ける」
Was it just me ...? で「気のせい」を表現できます。
ーWas it just my imagination or did I hear a tuna can being opened?
「ツナ缶が開けられる音を聞いたんだけど気のせい？」
Was it just my imagination ...? でも「気のせい」を表現できます。
ご参考まで！
カナダ 
