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We use an adverb, and not an adjective, to qualify a verb.
After verbs such as look, feel, sound, taste, smell use an adjective instead of an adverb: Sugar tastes sweet (not sweetly).
And is a conjunction, and can only join similar forms of speech: He came and sat down. We can't use it instead of the adverbs also and too.
The adverbial form is in a friendly way. Friendly is an adjective: a friendly game, to have friendly relations with one's neighbours, etc
So is an adverb, and must qualify an adjective or another adverb. Such is an adjective and must qualify a noun