语法

Introductory it as Subject

Pattern group 4: it be V-ed clause

There are three patterns in this group, each consisting of it, a verb in the passive, and a type of clause. This pattern is always passive; there is no active equivalent containing it.
    4.1 it be V-ed that
    It is thought that the temple was used in the third century.
    4.2 it be V-ed to-inf
    It was decided to cancel the meeting.
    4.3 it be V-ed wh
    It is not known what causes the disease.

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