Uses Of It
It is a pronoun used for lifeless things and animals. I have bought a table; it is made of teakwood. The dog is ill; it should be taken to the hospital. It is often used to refer to a young...
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It As A Preparatory Subject | English Grammar
When the subject is an infinitive expression, the sentence often begins with it. Preparatory it is common before be + adjective/ noun complement. It is difficult to accept your advice. (More natural than To...