Aprenda inglês de verdade com filmes e livros.

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He's the tallest from all the boys.
He's the tallest of all the boys.
Also possible:
He's the tallest boy in the class.

Precede adjectives (or adverbs) in the superlative degree by the and follow them by of or in.

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The teacher spoke about bad habits.
The teacher spoke for 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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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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Liam has a flat in Paris.
Liam has a flat at Paris.
My mother is staying at 66 Argyle Street.
My mother is staying in 66 Argyle Street.

We use in to describe the physical location of something as part of a larger thing or place. We use at when we're talking about an address, a public place or building (a bus stop, the Post Office, the library etc.) and cases in which the location is irrelevant but what we do there is what matters (school, the dentist, dance class etc.) 

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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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