Syntactic components of spoken languages (which most of the times are not context-free but context-aware) are defined by human interaction. There are a lot of problems:
1. Semantic elements like pronoums are defined in a per-language basis. We could say that in English we have a pronoum "nosotros" which can be translated as "we" in english. It is the same in each aspecto. However in Quichua they have a distinction between "we (but not you; I'm describing a situation involving my people)" translated to noqayku (exclusive-we), and "we (you and me, or you and exclusive-we)" translated to noqanchis or noqanchik (it depends on the region), but people talking mapudzungu (lit. language of the Earth from Mapuche tribe in Argentina/Chile) has a strange form of dual we (you and me, just 2 people).
2. Entire words or particles? It is also a matter of language! In English you can say "my dog" where "my" is a possesive for 1st-singular and "dog" is the man's best friend. In quichua you say just a word: allkuy (or allqoy or ashqoy in other regions) where allku is dog, and an aggregate ·y particle is the possesive (not a separate word).
3. Communicating with words or world-alike sounds is just too mammalic. 312
Perhaps you can even imagine a world without words (ej. bees, ants). Perhaps lights, lower-frequency waves, farts. Spoken languages are spoken sequentially and depending on the sequence they will also define the involved culture (Quichua and German speaking people will not tend to interrupt a lot as people from Argentina does, because the verb comes at the end!). Sequence becomes important in spoken languages, but not necessarily in other type of communications (e.g. if I insult you saying <PERSON> I'm remarking the 2nd insult which could be translated as "gay", whereas if I'm insulting you as "<PERSON>", I'm assuming you're gay but remarking the "fat" part: even when they are two distinct elements in the same syntactical category, the order matters). If you are bound to use a word-system (i.e. language) and need words with different structure you will need a different conception about surrounding phenomena (alikes, objects, stuff moving, attributes, time, senses), and you will have to even redesign (shallowly) the most important matters about their brain and interaction. Before you define the language, ensure you define the brain somehow. If you conceive aliens from a human perspective, you will get human-like aliens. 209