快速答案
preço 表示单件商品的价格；conta 表示应付账单或账户。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
conta
bill or account
Use conta for an amount to pay after service, or an account with a business or bank.
preço
price
Use preço for the stated cost of a product or service.
如何选择
- conta: Choose conta if the sentence points to an amount to pay after service, or an account with a business or bank.
- preço: Choose preço if the sentence points to the stated cost of a product or service.
例句
A conta do restaurante chegou.
The restaurant bill arrived.
Qual é o preço deste livro?
What is the price of this book?
常见误区
Before ordering, you ask the preço. After eating, you ask for the conta.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 conta，一次用 preço。如果两个版本都可以，说明意思怎样变化。