I've had a number of misunderstandings over the last decade where in hindsight, my communication was the root cause. My favourite: "I would". Meaning "in your situation, I would do X". And the person later came back and said "but you said you would do it".
In fact, even if I was in "speak simply" mode, I would still use "would" instead of, perhaps, "recommend," as "would" is a shorter word: I favor simpler words over multi-syllable versions when trying to be maximally understandable to someone whose native language is not English. I'm glad you brought it up!
After re-reading I probably see the issue, but you never said "I will do X" which changes to would in reported speech:
I will do X -> You said you would do X.
Did they understood "I would do X" as "I will do X"?
The other day Duolingo did show me you can say "и A и B" ("и" being "and") to say "both A and B". Start a sentence with "and", a conjunction, without anything before to... "conjunt"... I still can't parse it without raising an exception.