快速答案
informar 强调提供的信息；comunicar 强调让另一方知晓。
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
informar
to inform or provide information
Use informar for giving facts, data, instructions, or an answer to someone.
comunicar
to communicate or make known
Use comunicar for formally announcing a fact or establishing communication between parties.
如何选择
- informar: Choose informar if the sentence points to giving facts, data, instructions, or an answer to someone.
- comunicar: Choose comunicar if the sentence points to formally announcing a fact or establishing communication between parties.
例句
Informe seu número de inscrição.
Provide your registration number.
A empresa comunicou a mudança aos clientes.
The company communicated the change to its customers.
常见误区
They often overlap, but informar can simply fill a data field, while comunicar normally implies a recipient and a message event.
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 informar，一次用 comunicar。如果两个版本都可以，说明意思怎样变化。