There's a lot more to learning a different language than learning substitutions. For starters, there is hardly any bijective mapping between words. Translating

There's a lot more to learning a different language than learning substitutions. For starters, there is hardly any bijective mapping between words. Translating 'run' to German could mean any of 'rennen, renne, rennst, rennt, renn, laufen, laeuft' and I am sure I am missing quite a bit. And that only scratches the surface, let's not get started about Grammar or idioms, etc. The word order really only adds negligible overhead.