# But now ask the animals ... the birds ... they will tell you

Job is saying that the animals and the birds understand God better than Job's friends do. All occurrences of "you" are plural.

# But now ask the animals, and they will teach you

"But if you ask the animals, they will teach you"

# ask the birds of the heavens, and they will tell you

if you ask the birds of the heavens, they will tell you"