1. Referring to an object mentioned before;
I saw a movie last night. It was very interesting. I enjoyed it very much.
2. Meaning time, day, date, month, year, weather, climate, seasons and
situation:
It was 6 o‟clock in the morning.
It is cloudy today.
It was Friday, 17 August 1945.
3. Formal/Impersonal/Preparatory/Meaningless:
It is important to study history.
It is true that education determines one‟s future.
It is no use crying over spilt milk.
It takes us twenty minutes to get to the airport.
It is hoped that the economy will be better next year.
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