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Use a comma to separate contrasting parts of a sentence. Example: That is my money, not yours. Rule 16a. Use a comma before and after certain introductory words or terms, such as namely, that is, i.e., e.g., and for instance, when they are followed by a series of items.ule 1. Use commas to separate words and word groups in a simple series of three or more items. Example: My estate goes to my husband, son, daughter-in-law, and nephew.
The manual holds that women mustn't choose a programme themselves, but instead wait to be assigned to a module. You use a comma before but if it introduces an independent complete clause. As there's no independent clause after but in the sentence presented above, it doesn't need a comma before but. The manual holds that women must not choose a programme themselves, but instead wait to be assigned to a module. Comma usage varies among writers.