Excel formula from plain English

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I use [GOOGLE SHEETS / LIBREOFFICE CALC / EXCEL]. My data: [DESCRIBE COLUMNS, e.g. A = date, B = name, C = amount].
I want a formula that [WHAT YOU WANT, e.g. totals column C for each name in May].
Give me the formula, explain it in one line per part, and show what to do if I get an error.

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