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Common mistakes

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We walked to the river and back.
We walked till the river and back.
I'll stay here till next month.
I'll stay here to next month.

Use to with distance, and till (until) with time.

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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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My uncle will arrive at Saturday.
My uncle will arrive on Saturday.
I usually get up on seven o'clock.
I usually get up at seven o'clock.
She goes for a walk at the afternoon.
She goes for a walk in the afternoon.

Use on with the days of the week or month: on Friday, on March 25, on New Year's Day. Use at with the exact time: at four o'clock, at dawn, at noon, at sunset, at midnight. Use in with a period of time: in April, in winter, in 1945, in the morning. Also at night and by day.

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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.

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He's the tallest of all the boys.
He's the tallest from 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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