Questions & Answers about O documento está sob o livro.
- O = the (masculine singular definite article)
- documento = document (noun)
- está = is (3rd person singular of estar)
- sob = under / beneath (preposition)
- o = the again
- livro = book (noun)
So the structure is:
article + noun + verb + preposition + article + noun
Because Portuguese normally uses estar for location.
- O documento está sob o livro. = The document is under the book.
- é comes from ser, which is usually used for identity, definition, and more permanent characteristics.
So:
- O documento é importante. = The document is important.
- O documento está sob o livro. = The document is under the book.
Using é here would sound wrong.