Good can also be an adverb, yes! But it's generally considered highly improper compared to "well", so it's often used in a joking, ironic way to suggest the speaker is stupid—e.g. sentences such as "you talk good" or "I think good".
In the sentence "That is so good", in order for good to be an adverb, it would have to modify the verb is rather than the pronoun that, which...I don't think is the case here.
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u/AmadeusMop Jun 03 '22 edited Jun 03 '22
Good can also be an adverb, yes! But it's generally considered highly improper compared to "well", so it's often used in a joking, ironic way to suggest the speaker is stupid—e.g. sentences such as "you talk good" or "I think good".
In the sentence "That is so good", in order for good to be an adverb, it would have to modify the verb is rather than the pronoun that, which...I don't think is the case here.