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Questions & Answers about Onde estão os livros?
Why do we use estão instead of the other Portuguese verb for 'to be'?
How do you pronounce the -ão ending in estão?
The tilde (the squiggly line over the 'a') tells you it is a nasal sound. It sounds a bit like the English word 'ow', but spoken through your nose. Imagine saying the 'ound' in 'sound' without fully pronouncing the 'n' or 'd' at the end.
Is it okay to say Onde os livros estão? instead?
Why do we need os before livros?
Os means 'the' for masculine plural words. In Portuguese, it is standard to include the definite article before the noun when talking about specific things, just like in the English translation 'Where are the books?'.