It is marking "Quero ver um pàssaro" as incorrect? But isn't the subject pronoun optional?
Yes, it is optional. It might be marking it wrong if you wrote «pàssaro», as it should be «pássaro» with an acute accent on the first «a». If not, then I would report it.
I think it was the accent! Thank you :)
If it is a listening exercise "Type what you hear", then every word is necessary, even if it is not grammatically necessary.
The audio sounds definitely as ,,vir" instead of ,,ver".
I don't hear it....
How is does this question belong in the Modal verb section?
Because it has the modal verb «querer»