有些单词无论何时均应大写；有些单词只在用作标题的组成部分、人名或地名时大写.像“the”这样较不重要的单词只在作为句首或正式名称的开头时才大写.
· 错误例句:The pet store closes on Valentine's day.
· 正确例句:The pet store closes on Valentine's Day.
· 错误例句:Mary has a map of the Hague.
· 正确例句:Mary has a map of The Hague.