快速答案
比较巴西葡萄牙语中的 ser vs. estar：何时使用每个词，以及要避免的常见错误。
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
ser
to be for identity
Use ser for identity, origin, time, ownership, definitions, and stable qualities.
estar
to be for state or location
Use estar for temporary conditions, location, ongoing results, and how something is right now.
如何选择
- ser: Choose ser if the sentence points to identity, origin, time, ownership, definitions, and stable qualities.
- estar: Choose estar if the sentence points to temporary conditions, location, ongoing results, and how something is right now.
例句
Eu sou estudante.
I am a student.
Estou em casa.
I am at home.
常见误区
Do not decide from the English word "be" alone. Ask whether the sentence identifies something or describes a current state.
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 ser，一次用 estar。如果两个版本都可以，说明意思怎样变化。