I've known both English and Spanish native speakers who learned German and I wouldn't call it easy judging by their experience. It's definitely a stretch to call them sister languages. They have the same origin and a lot if the grammar and vocab will be somewhat familiar, unlike learning Arabic or Japanese or something completely different. Having said that, it's not a terribly difficult language either. The cases are probably the biggest stumbling block, but with only four I think it's manageable.
__________________
Por favor, corrijan mis errores. ¡Gracias!
|