A superlative form of something compares three or more things. For example, the superlative form of beautiful would be most beautiful and the comparative form would be more beautiful. Another example would be big, superlative would be biggest and comparative would be bigger.
more rapid
Happy is an adjective. The adverb form is happily. The comparative adverb form is more happily, and the superlative is most happily. When a comparative has two syllables as in happy, in most cases it can be used two ways (1) happier, or (2) more happy. Either way is correct. However, the -LY adverb forms must use "more" and "most" to express the comparative and superlative.
More quickly would be the comparative form. Any adverb that ends with an "-ly" would take more for comparative and most for the superlative forms.
Shallower, shallowest. More shallow, most shallow. Both forms are acceptable, but the first (..er, ..est) is probably more commonly used.
The comparative of rapid is more rapid
"Original" is an adjective, not an adverb. The comparative form is "more original". The adverb is "originally" and the comparative of that would be "more originally".
The adverb form is "easily" and the comparative is "more easily."
A superlative form of something compares three or more things. For example, the superlative form of beautiful would be most beautiful and the comparative form would be more beautiful. Another example would be big, superlative would be biggest and comparative would be bigger.
The adjective stranger is the comparative form of the adjective strange. The adverb "more strangely" is the comparative form of the adverb, strangely.
The comparative form of the adverb soon is SOONER: She arrived SOONER than the other guests.
Never is an absolute or non gradable adverb; there is no comparative form.
No, it is not an adverb. The adjective clearer is the comparative form of clear.
more rapid
higher
willing
No, it is not an adverb. Stronger is the comparative form of the adjective strong. The related adverb form would be "more strongly."