when making lists - I like playing tennis, listening to music, chatting with friends and watching TV., to separate (longer) adjectives when there are a few before the noun - He's an enthusiastic, hard-working student., after an adverb or a short introductory phrase at the beginning of a sentence, e.g. at first, consequently, however, finally, in my opinion, etc) - Generally, people in my country start university aged 19. , after a time phrase at the beginning of a sentence - In 2004, he left school and went to university., after clauses at the beginning of sentences starting with if, unless, when, while, although, etc. - When everyone in a family helps with the housework, they have a better relationship.,  when we join two sentences with but, we often put a comma before but - He got quite good marks in his exams, but he wasn't happy with his results.,

FCE 3 - Use commas (,) ...

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