IT

pronoun

1

BAD : Is easy to buy exactly what you want in a big city.

GOOD : It's easy to buy exactly what you want in a big city.

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When you comment on a situation, the subject of the sentence is usually it : 'It's impossible to read in the dark.' 'It was good to see you again.' 'It's hot today, isn't it?' 'It was a miracle that nobody was injured.'

Note that in this pattern it has no meaning. It simply fills the subject position.

2

See HAPPEN 1 (↑ happen )

3

See APPRECIATE 2 (↑ appreciate ), BEAR 2 (↑ bear ) , FIND 2 (↑ find ) , LIKE 3 (↑ like )

4

See NEED 1 (↑ need )