enough

enough + noun

Enough can be used before a noun as a determiner.

• Have you got enough milk?
• There aren’t enough glasses.

Enough is occasionally used after a noun, but this is rare in modern English except in a few expressions.

• If only we had time enough …
• I was fool enough to believe him.

Before another determiner (article, possessive, etc) or a pronoun, we use enough of. Compare:

• I don’t know enough Spanish to read this. (not … enough of Spanish …)
  I don’t understand enough of the words in the notice.
• We haven’t got enough blue paint. (not … enough of blue paint.)
  We haven’t got enough of that blue paint.
• You didn’t buy enough cards. (not … enough of cards)
  You didn’t buy enough of them.

Note the idiomatic structure I’ve had enough of … This can be followed by a noun without a determiner.

• I’ve had enough of mathematics; I’m going to give it up.
• She’s had enough of England; she’s going back home.

Without a noun

Enough can be used alone without a noun to refer to an amount, if the meaning is clear.

• Half a pound of carrots will be enough.
• That’s enough, thank you.
• Enough is enough.
• but not The meat is enough. (The meat is not an amount.)

note

For other uses of enough, and word order with nouns and adjectives, (see here).