Notes On Usage of Comma - CBSE Class 7 English Grammar
1. Use a comma between items in a series or list. In a sentence, the last two items usually do not need a comma between them as they are separated by "and". However, if one or both of the last two items are long, a comma may be useful.
  • My favorite sports are footballrugbyswimmingboxing and golf.
2. Use a comma between three or more adjectives or adverbs.
  • He bought an oldredopen-top Volkswagen.
  • He ran quicklyquietly and effortlessly.
4. Use a comma for numbers over 999. (In English, commas separate thousands and periods separate decimals. Note that some languages use the opposite system.)
  • 1,000 (one thousand)
  • 1,569
  • 10.5 (ten point five or ten and a half) - note the use of the period, not comma
 

Summary

1. Use a comma between items in a series or list. In a sentence, the last two items usually do not need a comma between them as they are separated by "and". However, if one or both of the last two items are long, a comma may be useful.
  • My favorite sports are footballrugbyswimmingboxing and golf.
2. Use a comma between three or more adjectives or adverbs.
  • He bought an oldredopen-top Volkswagen.
  • He ran quicklyquietly and effortlessly.
4. Use a comma for numbers over 999. (In English, commas separate thousands and periods separate decimals. Note that some languages use the opposite system.)
  • 1,000 (one thousand)
  • 1,569
  • 10.5 (ten point five or ten and a half) - note the use of the period, not comma
 
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