Which sentence is grammatically correct?

yo duermo ocho horas.

yo dormo ocho horas.

nosotros duermimos ocho horas.

ellos dormen ocho horas.

Anybody planning on traveling to a spanish-speaking nation sometime in the next months or so have to make a program so that can make a dissent conversation in spanish or just to understand when folks talk to them due to the fact by the time your trip rolls around you must be conversationally fluent or rather near to it with the assist. hope this

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Bolívar's attack on new granada is considered one of the most daring in military history, compared by contemporaries and some historians to napoleon's crossing of the alps in 1800 and josé san martín's crossing of the andes in 1817.