No, it is a verb, the past tense and past participle of to grumble. The word grumbled is not normally used as an adjective, either.
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No, it is an adjective. The adverb form is beneficially.
Yes, you can change patience into an adverb. The adverb is "patiently."
Yes, it is an adverb. It is the adverb form of "ready" and means quickly and easily.
No, it is not an adverb. Became is the past tense of the verb become.
Yes, begrudgingly is an adverb.