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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.
Use by (not from) after the passive form to show the doer of the action.
When you warn to show the means or the instrument with which the action is done, use with. By denotes the order of the action: The bird was shot by the man.
The following take by and not with: by hand, by post, by phone, by one's watch, by the hour, by the dozen, by the metre.
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.