In grammar, a preparatory subject or anticipatory subject 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".
- 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".
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