1)
What is "Olamim"?
1.
Radak: It is long periods of time.
2)
Why does it say "Lo Sevoshu"?
1.
Radak: The Navi addresses Yisrael [in second person].
3)
What is "Ad Olemei Ad"?
1.
Radak: It is all the days of the world. Malbim - since their salvation will be permanent, they will never be ashamed.