Here's what I mean by talking about all the decision points in the translation problem in Project Hail Mary (which includes all normal translation problems and then some).
There's a lot of Rocky utterances in the movie that are likd: "Grace Stupid." Non-standard sentence of English, perfectly normal sentence of, say, Arabic. Rocky's translated speech doesn't use the copula (be-verbs). The problem is, where in the process does this fact originate? There are a number of possibilities:
Eridian has no copula
Eridian has a copula but Rocky is choosing not to use it
Rocky is using a copula but it is marked in a way that the translation program can't recognize
There is a copula but Grace hasn't recognized or elicited it yet
There is a copula but due to linear placement translating it as such would make Rocky's utterances less comprehensible
Grace doesn't think the copula is linguistically necessarily and so doesn't bother
So for every linguistic feature we can derive, we have to ask (and I think mostly we can't know) - is this a fact about Eridian, is this a choice Rocky is making, is this an artifact of the technology, or is this a choice Grace is making?
What would be really interesting is if it changes over time. I haven't read the book but if it were me I would make it change over time.
The translation software is supposed to just match each Eridian word with its English equivalent.
All of the grammar adjustments come from Rocky, as explained in the book:
Rocky has picked up the basic word ordering of English. I think he realized early on that I can’t automatically remember stuff, so he works with my system rather than trying to teach me his. I probably seem pretty stupid, honestly. But some of his own grammar sneaks in once in a while. He always ends a question with the word “question.”
One of the things that I think are important but the movie unfortunately left out is that Grace also makes an effort to simplify his speech for Rocky. In the beginning, he speaks in very short sentences with limited vocabulary. Later he starts talking in more complex or casual ways, but the level and style of his speech always match Rocky's pretty closely. This post collected some good examples.
Here are a few other book quotes in chronological order, showing the evolution of Rocky and Grace's dialogue:



















