Just as fish presumably don’t know they’re wet, many English speakers don’t know that the way their language works is just one of endless ways it could have come out. It’s easy to think that what one’s native language puts words to, and how, reflects the fundamentals of reality.
But languages are strikingly different in the level of detail they require a speaker to provide in order to put a sentence together. In English, for example, here’s a simple sentence that comes to my mind for rather specific reasons related to having small children: “The father said ‘Come here!’” This statement specifies that there is a father, that he conducted the action of speaking in the past, and that he indicated the child should approach him at the location “here.” What else would a language need to do?
Well, for a German speaker, more. In “Der Vater sagte ‘Komm her!’”, although it just seems like a variation on the English sentence, more is happening. “Der,” the word for “the,” is a choice among other possibilities: It’s the one used for masculine nouns only. If the sentence were about a mother, it would have to use the feminine die, or if about a girl, the neuter das (for reasons unnecessary to broach here!). The word for “said,” sagte, is marked with a suffix for the third-person singular; if it were “you said,” then it would be sagtest—in English, those forms don’t vary in the past tense. Then, her for “here” means “to here”: In German one must become what feels to an English speaker rather Shakespearean and say “hither” when that’s what is meant. “Here” in the sense of just sitting “here” is a different word, hier.