Use adjectives after sense verbs such as look, smell, taste, feel, or sound or after linking verbs (is, am, are, was, were and other forms of be): The steak tastes very good.

Most adverbs end in –ly; use adverbs after transitive and intransitive verbs/verbs of action: She submits her paperwork promptly.

Bad and Badly

Bad is an adjective: I feel bad about the delay.

Badly is an adverb: It doesn't hurt so badly now.

Good and Well,

Good is an adjective: You look good in red. You wear it well.

Well is an adverb: He gets along well with his co-workers.

Well is also an adjective when it is used to refer to health: I am not well today. I don’t feel well (OR good) today.

Real and Really

Real is an adjective meaning "genuine"; really is an adverb: The admiral has real charm, so he is really charismatic.

The use of real as an adverb is colloquial or nonstandard: He writes real really well.

Sort of and kind of are often misused in written English by writers who actually mean rather or somewhat: Lannie was kind of rather saddened by the results of the test.

Sure and Surely

Sure is an adjective; surely is an adverb. Try changing sure to certain and surely to certainly.

I am sure about my decision to retire. We surely were shocked by your decision to retire.