Identify the adverb in the given sentence:

This is a hospital. Please speak quietly.

The correct answer is option 4) i.e. quietly.

Explanation  

• As we have to find the adverb in the given sentence let us understand an 'adverb'.
• An adverb is a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc.
• Adverbs are formed by adding (-ly) to an adjective.
• Now, we have to find if any word ending is with or without (-ly) and modifying a verb or adjective.
• From the given options:
  • 'Hospital' acts as a noun in the given sentence.
  • 'Speak' acts as a verb in the given sentence.
  • 'Please' acts as a verb in the given sentence
  • 'Quietly' is ending with (-ly) and modifying the verb 'speak' so we can say that it is an adverb.
• Hence, the option 'Quietly' is identified as an adverb in the given sentence.

• Adverbs and adjectives have important characteristics in common, in particular their grade ability, and the fact that they have comparative and superlative forms.
• However, an important distinguishing feature is that adverbs do not modify nouns, either attributively or predicatively.
• The comparative 'better' and the superlative 'best', as well as some words denoting time intervals (daily, weekly, monthly), can also be adverbs or adjectives, depending on how they are used.
• We can see that many adverbs end in (-ly). More precisely, they are formed by adding (-ly) to an adjective.
   

  Adjective	slow	quick	soft	sudden	gradual
  Adverb	slowly	quickly	softly	suddenly	gradually