I was wondering if I could... 我不知道能否（礼貌询问/请求）
I wonder if... 我在想是否
No wonder 难怪
I was wondering if I could exchange them for another pair.
I was wondering if I could borrow your car.
I wonder if i did the right thing, giving him away.
No wonder she's angry.
Exchange 交换 Receipt 收据
exchange sth for sth 以某物换某物
exchange sth 交换某物
I exchange those trousers for a lager size.
Since you are a loyal customer, I'll exchange this box for another one.
They exchanged phone numbers.
Do you have a receipt?
loral customer 老顾客
give sth back 退回某物
take sth back 收回某物
return sth 退回某物
She couldn't give the painting back
The store said they won't take it back because you signed for it
I'm returning the ring
I want to return this
