Point being, many study for tests but can't speak English.
Take "welcome."[1] Well come. You've arrived well. You make a good entrance? Not a ridiculous thing to say when someone arrives.
What about in response to "Thank you?" You are welcome.[2] Huh? What does that mean?
Or, "you are welcome to take a second cookie." How does that translate into "I do not mind if you take a second cookie?"
[1] Welcome translates quite literally in other European languages. For example, in French, it is bienvenue - bien: well - venu: came.
[2] On the other hand, it is much more common to say de rien (in French) or de nada (in Spanish): literally, "it's nothing."
The french "bienvenue" seems to be a too-literal translation from wiljakumo [0]. A similar construction is missing in Latin.
An example that comes to mind is the oversimplification that happens when people say that the word "aloha" means "hello" and "goodbye". It only sort of does because that's how it is sometimes used. Really it's a whole concept that is unique to Hawaiian culture that would more accurately translate to "beloved" or "cherished".
I don't want to sound bragging, but I never translate languages in my head. If I do that it will feel like the equivalent of database searching with a query, I feel exhausted if I have to look for something phrase by phrase (or matching). I admit that when I'm writing or organising thoughts I have to go over words so searching does happen.
Obviously it is down to personal experiences...
In the Netherlands, correct grammar is only a small part of the final score, and what is given far more weight is how well one is able to understand the speaker and convey one's thoughts to the listener, and far more emphasis is placed on practicing conversations, even though they not be grammatically sound, which in Finland would be considered walking before having learned to crawl, but it seems to work.
There was an early translation program in China that was both popular and notoriously bad. For example, the simplified character 干 has a number of meanings, most commonly "dry", but the program would always pick "fuck" -- the end result being supermarket aisles with signs saying "Fuck Goods" and restaurants offering dishes like "Duck Fuck Noodles". Engrish.com (sic) has a whole category for these:
I guess that is what they must be doing. But I still don't quite understand why they would spend thousands of dollars creating a product, tooling, packaging, instructions etc and then not spend, what, ~$100 getting a half-way decent translation.
Of course, that's much easier in conversation than written communication. A good reason to make small talk with your co-workers.