In grammar, a preparatory subject or anticipatory subjectNovalearn: Anticipatory subjectGrammar glossary is a subject which represents a verb clause later in the sentence. It as a preparatory subject is "commonly used in speech and writing, especially when the subject is longer than the complement and is better placed at the end of the sentence".
Examples It is fun to play the piano is equivalent to Playing the piano is fun "It" in the first sentence is a preparatory subject, referring to the clause "to play the piano".English Grammar: It as a preparatory subject
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External links English grammar: It as a preparatory subject