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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.) 

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.

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.

Ian's been ill since last Friday.
Ian's been ill from last Friday.

Place the preposition since before words or phrases denoting a point in time: since Monday, since yesterday, since eight o'clock, since Christmas. When we use since, the verb is usually in the present perfect tense, but it may be in the past perfect: I was glad to see Tom. I hadn't seen him since last Christmas.

From can also denote a point in time, but it must be followed by to or till: He works from eight o'clock till one o'clock without a break.

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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