Just as a matter of interest, how much did you pay for it?
我只是感興趣，你這是花多少錢買的？
It seems unfair on him to make him pay for everything.
讓他承擔一切費用似乎對他不公平。
The reality is that there is not enough money to pay for this project.
實際情況是沒有足夠的錢花在這個項目上。
They pay for their children to go to a posh school.
他們花錢讓子女上貴族學校。
The rail pass will pay for itself after about two trips.
火車月票大約只需乘兩次車就夠本了。