我只是刚好路过的英文

“对不起，我没有想到有个人在这里。”
Sorry, I thought no one lived here.
Sorry, I didn't expect to find anyone here.

“没关系，我只是刚好路过而已。”
Never mind, I'm just passing by.

“对不起，我没有想到有个人在这里。” Sorry, I don't think there is someone in here
没关系，我只是刚好路过而已 It doesn't matter, I'm just going by

Sorry，I thought nobody's here.
It's ok, I am just passing by.
这是比较口语化的

Excuse me,I don't expect that there will be someone here.

Never mind,I just pass by.

Sorry, don't know someone's here.

Never mind. Just passing by the way.