Dear teachers,

I have three questions to ask:

No.1
A new economic recession has set in for that country.
I know "set in" means "start". My question is: Is "set in for" a phrase?

No.2
We can say "set to work". But in Random Dictionary there is "set about work". Does it mean the second phrase has been accepted?

No.3
We wnet along a road that led down into a valley, about a mile out of town, where there was a pond. I think the underlined parts are attributes. Is that right?

Looking forward to hearing from you.
Thank you in advance.

Jiang