Final answer:
The sentence 'Juan va a darlos' is grammatically incorrect. In Spanish, the direct object pronoun 'los' should come before the verb 'va'. The correct sentence is 'Juan los va a dar.'
Step-by-step explanation:
The sentence 'Juan va a darlos' is grammatically incorrect.
In Spanish, when using a direct object pronoun like 'los', it needs to come before the verb 'va'.
So the correct sentence would be 'Juan los va a dar.'
Learn more about Spanish sentence structure