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 football, rugby, swimming, boxing and golf.
2. Use a comma between three or more adjectives
- He bought an old, red, open-top Volkswagen.
- He ran quickly, quietly 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)
- 10.5 (ten point five or ten and a half) - note the use of the period, not comma