1) Do not place a comma before "that"; 2) Do not place a comma before who or which if the information provided by the relative clause is essential; 3) Place a comma before who or which if the relative clause is not necessary to know who or what the speaker means. The comma rules regarding the relative pronouns who, which and that in English are as follows: The man that lives next door is tall. The man, that lives next door, is tall. Do not place a comma before who or which if the information provided by the relative clause is essential to understand which person or thing (or what kind of person or thing) the writer is talking about. The man who lives next door is tall. The man, who lives next door, is tall. We need the relative
clause "who lives next door" to know exactly who is the man the speaker is talking about. We do not add commas in a situation like this. Place a comma before who or which only if the relative clause is not necessary to know who or what the speaker means. In this case, the relative clause provides additional information about the person or thing (or the type of person or thing), but this extra information is not essential. My neighbor
Peter, who lives next door, is very tall. Before saying "who lives next door", the reader knows who you are talking about (your neighbor, Peter). The clause "who lives next door" just adds extra information. My neighbor Peter who lives next door is very tall. Contents
1. Using Commas with Relative PronounsLook at this example: People who live in cities are more stressed. "Who live in cities" is a relative clause (a part of a sentence that tell us what type of person or thing the speaker means). Relative clauses begin with relative pronouns, such as who, which, and that. The children who read at home regularly make the most progress. "Who read at home regularly" is essential to understand the meaning of the sentence. If we omit this clause, the sentence makes no sense in this context. The children make the most progress. The sentence above is incorrect because we are trying to say that only some students, those who read at home regularly, make the most progress. In other words, leaving out commas helps you clarify who or what you are talking about. Another example: My brother, who works as a dentist, is wealthy. If we take out the relative clause ("who works as a dentist"), the sentence is complete and makes sense. It also provides the most meaningful information (he is wealthy). 2. Using a Comma Before 'Who' or 'Which' May Change the Meaning of a SentenceExamine this example: My sister, who is very tall, can speak English and French. This sentence is correct because you are assuming that the reader knows who you are talking about (your sister). However, if you have two sisters, the reader may need to know which sister you are mentioning. Remember, we must not use commas if the information is essential to know who or what you are talking about: My sister who is very tall can speak English and French. Another example: I'm planning to go to Spain which is very sunny next month. In a situation like this, the use of commas is not optional (they are required). The clause before the relative pronoun tells us where you are going (Spain). The relative clause "which is very sunny" just adds extra or additional information about Spain. I'm planning to go to Spain, which is very sunny, next month. 3. 'Who' and 'Which' vs. 'That' Regarding Comma UsageRemember that we do not use commas before that. Paris, that is the most romantic city in the world, is a beautiful place to live. Rebecca, that lives in New York, is very smart. In a situation like this we must use who (for persons) or which (for things). Paris, which is the most romantic city in the world, is a beautiful place to live. Rebecca, who lives in New York, is very smart.
5. More Examples with 'Who'
6. More Examples with 'That'
7. More Examples with 'Which'
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