No. Simple is an adjective. The adverb form is "simply."
Simply.
An adverb
Yes, it is an adverb. It is the adverb form of the adjective "essential" (requisite, important).
The word below can be an adjective, adverb or preposition. It is an adverb in the sentence: "To see another example, look below."
Basically is an adverb, yes.Some example sentences are:Basically, he just screwed up.This is basically everything you need.
Adverb
simply
Simply is an adverb (in a simple way, or literally).
Simply.
An adverb
Simplement
"Was copying " doesn't contain an adverb, it is only a verb (or simple predicate).
No. Often is an adverb.
Both?
The adverb is invisibly. Many -LE adjectives can form the adverb by changng the final E to Y (able, ably / simple,simply).
A verb in the simple past.
The noun element has the adjective form elemental. The adverb form is elementally. A related adjective is elementary, which has a connotation of basic or simple. The adverb is elementarily.