In many kinds of English sentence, you will find the word "it" or the word "there" in the subject position. These are usually "impersonal" sentences -- sentences where there is no natural subject. This introduction will help you to understand when to use "it" and when to use "there".
Impersonal "it"
When to use it
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Examples
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Talking about weather
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It's raining. It's cold. It was sunny yesterday.
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Identifying something
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"Who is it?" "It's me." "What is it?" "It's a cat."
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Talking about time
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"What time is it?" "It's five o'clock." "What day is it?" "It's Thursday."
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Talking about distance
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"How far is it to Toronto?" "It's 4000 kilometers."
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Impersonal "there"
Impersonal "there" is used to say that something exists in a particular place:
Singular
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There is a book on the table.
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Plural
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There are three men in the car.
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