pay for itself
- (of an object or system) earn or save enough money to cover the cost of its purchase
- (of a thing) earn or save enough money to cover the cost of its purchase
It is your turn to pay for dinner. = To pay for dinner is your turn. 兩句的動詞都是is... subject Crime doesn't pay.=犯罪花不來。 This stock pays poorly.=這檔股票不合算（因為賺得比定存還少）。 所以pay的主詞，不必是「人...
...the other two forms of payment? A. An owner of a credit card can pay for purchased goos and services at shops that accept that...
Have you paid for the fine? 你有付罰款/罰金嗎？ have+p.p (現在完成式)→最簡單的概念就已經做完 pay(v.)→付 fine(n.)→罰款/罰金