This question tests your understanding of verb forms and participles used as adjectives. The sentence structure requires a word that describes the supermarket.

The key part of the sentence is: "their newly _____ supermarket."

Let's analyze the structure:

• "newly" is an adverb modifying the blank word.
• The blank word itself is describing the noun "supermarket."
• When a word describes a noun (like "supermarket"), it functions as an adjective.

Now let's examine the options:

to decorated - This is grammatically incorrect. "To" is not used before a past participle in this context.

to be decorated - This is an infinitive phrase suggesting future action, not a current description of the supermarket.

decorated - This is a past participle functioning as an adjective, meaning "having been decorated." It correctly follows the adverb "newly" and describes the supermarket.

decorating - This is a present participle, which would suggest the supermarket is doing the decorating, not being decorated.

The correct answer is "decorated" because:

1. It follows the pattern: adverb + past participle adjective
2. It correctly describes the supermarket as having been decorated
3. It creates the appropriate meaning: the supermarket has recently been decorated

Complete sentence: "You must see their newly decorated supermarket."

Related Concepts

Participles as Adjectives: Past participles (verbs ending in -ed, -en, -t, etc.) can function as adjectives to describe nouns. They often have a passive meaning - the noun receives the action.

Adverb Placement: Adverbs like "newly" typically come before the adjectives they modify.

Key Formula/Pattern

Adverb + Past Participle Adjective + Noun

Example: newly decorated supermarket, beautifully written story, carefully prepared meal