快速答案
conhecer 表示开始认识或熟悉；encontrar 表示在某次场合找到或遇见。
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
conhecer
to know or meet for the first time
Use conhecer for becoming acquainted with a person, place, or subject.
encontrar
to find or meet
Use encontrar for coming across someone or meeting after the first introduction.
如何选择
- conhecer: Choose conhecer if the sentence points to becoming acquainted with a person, place, or subject.
- encontrar: Choose encontrar if the sentence points to coming across someone or meeting after the first introduction.
例句
Conheci a Ana na escola.
I met Ana at school.
Encontrei a Ana no mercado ontem.
I ran into Ana at the market yesterday.
常见误区
For a first introduction, conheci is natural. Encontrei does not by itself mean that the people became acquainted.
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 conhecer，一次用 encontrar。如果两个版本都可以，说明意思怎样变化。