How to use "in" to form an adverb?

[jibja]

I'm confusing if I want to use "in" to form an adverb, what shold I put after "in"? Is it a noun, verb, or adjective?

For example:
"She asked me in concern."

This concern is a noun or a verb, or shall I change it to concerned (an adjective)?

[Raymott]

I'm confused when I want to use "in" to form an adverb, what should I put after "in"? Is it a noun, verb, or adjective?

For example:
"She asked me in concern."

This concern is a noun or a verb, or shall I change it to concerned (an adjective)?

You need to use a noun. 'Concern' is a noun.

He raised his voice in anger.
They gathered together in sorrow.