pronoun
BAD : The car parking facilities are not enough.
GOOD : There are not enough car parking facilities.
BAD : The time isn't enough for us to catch the next train.
GOOD : There isn't enough time for us to catch the next train.
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Enough usually goes in front of the noun it refers to: 'Do you have enough money?' 'There aren't enough teachers.' For this reason, the sentence often begins with there is/are etc: 'Is there enough hot water for a bath?'