快速答案
sabia 是 saber 的过去时；sabiá 末音节重读，是一种鸟。
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
sabia
knew
Use sabia for the imperfect form of saber with eu, ele, ela, or você.
sabiá
thrush
Use sabiá for a common name for several songbirds in Brazil.
如何选择
- sabia: Choose sabia if the sentence points to the imperfect form of saber with eu, ele, ela, or você.
- sabiá: Choose sabiá if the sentence points to a common name for several songbirds in Brazil.
例句
Eu não sabia a resposta.
I did not know the answer.
Um sabiá cantava no jardim.
A thrush was singing in the garden.
常见误区
The accent changes both stress and meaning: SA-bi-a for the verb, sa-bi-Á for the bird.
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 sabia，一次用 sabiá。如果两个版本都可以，说明意思怎样变化。