|appear||He appears awkward.|
|become (always linking)||She became nervous.|
|feel||He feels bad about that.|
|get||He got very angry about that.|
|go||When he fainted, he went limp.|
|grow||He has grown weary.|
|look||She looks smashing.|
|prove||This procedure proved difficult.|
|remain||She remains fatigued.|
|seem (always linking)||She seems an honest woman.|
|smell||The stale milk smells foul.|
|sound||He sounded very sick.|
|taste||The steak tasted delicious.|
|turn||She turned green with envy.|
He feels badly about that.Notice that badly is an adverb, not an adjective (though there is a colloquial definition of badly as an adjective to mean sick or unwell). If the person really does feel badly (the adverb), it means he has deficient tactile abilities or perhaps a calloused soul incapable of doing a very good job of feeling.
He feels bad about that.
Let him do whatever comes naturally?Or should you say:
Let him do whatever comes natural?Isn’t the verb comes really saying is? As in whatever is natural? If so, and I think it is, you should say:
Let him do whatever comes natural.Similarly, consider the action intransitive verb stands in this sentence:
The men stood silent.Isn’t silent meant to describe the standers, not the act of standing? If so, then stood serves as a linking verb, or in grammatical lingo, as a copula. As such, it should link to adjective (silent), not adverb (silently).
The army travels light.The above examples appear in the earlier edition of Wilson Follett’s, Modern American Usage, pp. 50-53 (1966).