I
adverb
BAD : My sister often goes to the indoor pool but I don't like going to there.
GOOD : My sister often goes to the indoor pool but I don't like going there.
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See note at HERE 2 (↑ here )
II
pronoun
1
BAD : If you aren't busy is something I'd like to ask you about.
GOOD : If you aren't busy, there's something I'd like to ask you about.
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When you say that something exists or takes place, the sentence must have a subject. When there is no other subject, use there : 'There's a hair in your soup.' 'Suddenly there was a loud bang.' 'There are two police officers waiting to see you.'
Note that in this pattern there has no meaning. It simply fills the subject position.
2
BAD : There was four people in the car.
GOOD : There were four people in the car.
BAD : In Barcelona there is plenty of things for visitors to do.
GOOD : In Barcelona there are plenty of things for visitors to do.
BAD : There was a lot of girls watching the game.
GOOD : There were a lot of girls watching the game.
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Use there is/was when the following noun is singular/uncountable: 'There was a letter on the mat.' 'There was smoke all over the house.'
Use there are/were when the following noun is plural: 'There were babies crying in every room.' 'There are many times when I would prefer to be alone.'
Note that a lot of, plenty of, etc do not affect the number of the verb. Compare: 'There was a lot of traffic on the road.' 'There were a lot of cars on the road.'
3
See GOOD 2 (↑ good )