1)
Why does it say "Shav"?
1.
'Rashi': It means Heshiv (He returned).
2.
Ibn Ezra: Iyov was in the Satan's Reshus; Hashem returned him.
2)
Did this depend on Iyov praying for his friends?
1.
'Rashi': Yes - in this merit, Hashem returned him. Malbim - also, he pardoned their insult to him.
3)
What is "l'Mishneh"?
1.
'Rashi': Double [what he had before]; the verse is not precise.
2.
Malbim: Chazal imply that his children did not die, and his property was not plundered, just the Satan hid them, and sent messengers with evil tidings. Now Hashem added, so he had double what he had before.
