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Please answer! 1. How is the infinitive used in the sentence? Was that gigantic sandcastle difficult to build?

a. noun
b. adverb
c. adjective

User Robmcvey
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1 Answer

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The correct answer is: adverb.

It's also referred to as adverb infinitive. It modifies "difficult", which is a predicate adjective (it gives more information about the subject of the sentence and there is a linking verb).
User Sahaj Rana
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