It as a preparatory object

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It is sometimes used as a preparatory object. This happens when the object of a verb is an infinitive expression or a clause with an adjective or noun complement.

Subject + verb + it + complement + infinitive/clause

Note that this structure is not normally used when there is no adjective or noun complement after the verb.

Sections in this article

Expressions without prepositions
Prepositions at the end of clauses
Prepositions: some useful points
Common prepositions: usage