This English Language quiz is called 'Punctuation (Commas to Separate Clauses)' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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Commas act as a 'pause for breath' in English and help give structure to sentences. Use commas to separate clauses; a clause doesn't stand alone, e.g. 'When I telephoned him' is the clause adding information to 'he read me his shopping list' in Question 1.