快速答案
agora 表示现在；já 表示“到现在已经”，也可催促立刻行动。
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
agora
now
Use agora for the present moment.
já
already or right away
Use já for something completed by now, or an urgent immediate action.
如何选择
- agora: Choose agora if the sentence points to the present moment.
- já: Choose já if the sentence points to something completed by now, or an urgent immediate action.
例句
Estou ocupado agora.
I am busy now.
Já terminei o trabalho.
I have already finished the work.
常见误区
Já does not always mean “now.” In já comi, it means “already”; in venha já, it means “right away.”
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 agora，一次用 já。如果两个版本都可以，说明意思怎样变化。