這些細節很容易困擾大家,以下我比較完整來說明: 口語上我不會說不能用 pay by cash,但我不建議這樣用。 因為 by 是用在"透過什麼工具" 例如:pay by credit card / pay by check / pay by debit card 而cash是直接移轉的,正確用法有兩種: pay in cash / pay with cash 另外pay with也可以用在信用卡等工具上,但這時是強調某一張信用卡,例如: pay with a credit card / pay with my credit card