快速答案
achar 常表达日常看法或印象；pensar 强调思考过程。
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
achar
to think or find
Use achar for an opinion, impression, or discovery, especially in everyday speech.
pensar
to think or consider
Use pensar for the mental process of reflecting, planning, or forming an opinion.
如何选择
- achar: Choose achar if the sentence points to an opinion, impression, or discovery, especially in everyday speech.
- pensar: Choose pensar if the sentence points to the mental process of reflecting, planning, or forming an opinion.
例句
Acho que vai chover.
I think it is going to rain.
Preciso pensar antes de responder.
I need to think before answering.
常见误区
Both can introduce opinions, but their patterns differ: achar que algo and pensar em algo are especially common.
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 achar，一次用 pensar。如果两个版本都可以，说明意思怎样变化。