Aprenda inglês de verdade com filmes e livros.

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Erros comuns

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I bought a book at fifty pence.
I bought a book for fifty pence.
I can't buy it for such a high price.
I can't buy it at such a high price.

Use for if the actual sum is mentioned, use at if the actual sum isn't given.

If the weight or measure follows the price, use at with the actual sum: That velvet is available at £5 a metre.

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The teacher spoke for bad habits,
The teacher spoke about bad habits.

Don't use for in the sense of about. The chief use of for is to convey the idea of being in favour of. If we say that the teacher spoke for bad habits it's like saying that he/she spoke in favour of bad habits!

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We come to school every morning.
We come at school every morning,
Someone is standing at the door.
Someone is standing to the door.

Use to to express motion from one place to another, use at to denote position.

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I have other books besides these
I have other books except these.
Also possible:
I have other books as well as these

Except means to leave out: Everyone was present except John.

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I may be able to go after a week.
I may be able to go in a week.
Also possible:
I may be able to go in a week's time.

When speaking of a period of time in the future, use in, and not after. Here in means after the end of.

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