adverb
1
BAD : The weather in here is very cold.
GOOD : The weather here is very cold.
BAD : The people in here believe in Hinduism.
GOOD : The people here believe in Hinduism.
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Do not use in before here/there when you mean 'in this country or region': 'I'm having a problem with the food here.' 'Groceries here are much cheaper than in Japan.'
You use in here when you mean 'in this building/room/container etc': 'Nobody is allowed to come in here except authorized personnel.' 'I leave most of my books in here'.
2
BAD : She comes to here every afternoon to feed the birds.
GOOD : She comes here every afternoon to feed the birds.
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Do not use to before here/there unless you are indicating or pointing to something: 'When the tide comes in, the water reaches right up to here.'
3
BAD : You do not need to bring a coat because here is warm.
GOOD : You do not need to bring a coat because it's warm here.
BAD : Here is very different.
GOOD : It's very different here.
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When you are describing a situation, begin the clause with it (NOT here ): 'It's raining here.'