Translation:Oil is an important natural resource.
In another sentence the plural "os" article (towards the end of the sentence) was required by DL, where is was fully optional (according to sentence discussion and moderator reply) so I had to report the other sentence today.
As I am doing a skill test-out because of the new A/B PT tree, I tried it this time with my (hopefully to be accepted) answer "The oil is an important natural resource".
Now I am marked again wrong, because the only valid solution is "Oil" and not "The oil".
What is right?
Let me ask me a question on this. In Spanish there's a slight difference here that I wonder if might apply to Portuguese since both languages are closely related.
When we use the adjective before the noun we use it to state the obvious. On the other hand, when we use it after the noun it might be new information.
For example, if I talk about how important oil is, and everybody knows it, I might say '...importante recurso...' But if suppose this is the first time we've come across oil and nobody knows what this is I'd say '...recurso importante...'
Another example: '...o velho rei disse...' (everybody knows the king's old). '...o rei velho...' (some people might not know the king's old).
So, is there any reputable source where I could find an answer to this kind of questions? In Spanish we have the royal Spanish academy, which is an institution dedicated to regulate the language, is there something similar in Portuguese?