" I saw this sentence in a text book and I know how to interpret it but in spoken English, how can we distinguish between a sentence with a comma and a sentence without a comma? You hear a very slight pause. And isn't any chance to misunderstand these kinds of sentences among native English speakers?
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Clive What meaning do you think the customer will get?Thank you so much, and I know that there is a meaning difference between defining relative clauses and non defining relative clauses. So we might think "describing~" modifies "a letter" if there is no comma or a pause. I am sure that the sentence can be rewritten as "They wrote a letter to the company,