Englishfor English speakers
is
Verb
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A form of the verb be when talking about someone or something else.
He is late for class.
Is it hot in here?
it
Pronoun
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used to refer to an object without identifying or describing it; the object might have been described earlier in the text.
The house was very big. It had many rooms.
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used to describe the weather
It is very hot today.
I'm staying in because it is raining
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used to describe a situation in general
I don't like it when people tell me to do something.
It is hard to find a job.
it
Abbreviation
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It can be a short way of writing:
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# Italy or Italian
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# Information Technology, the use of computers
serious
Adjective
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A problem or situation is serious if it is not funny or comical, but important.
This is a serious problem. We must do something.
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A person is serious if the person is not laughing or joking, but saying what they mean.
I see. When you said the room was empty, you were serious!
The woman's face looked serious, so I knew she was saying something important.