Las válvulas distribuidoras pueden clasificarse en dos grupos means "The distributor valves can be classified into two groups"
Hey! I’m not too sure if this question is tied to notes or a lesson during class but from the general basis of the question I can assume that: Who, When, Where and Why are the words your looking for.
Hope this helps.
Answer:
I'm not 100% sure but I think it is lo mejor es ser franco
Explanation:
lo mejor es ser franco means "it best to be frank" or just tell him
