只要有形容词修饰时,一般就加限定词.
得了解一个概念：冠词也是限定词中的一个.
a hot summer
on the sunny Monday
特指就用the,泛指就用a比如说National Day is coming还是the National Day is coming？此时的National Day是不是特指？习惯上Day构成的节日是不加冠词的。如：May Day; National Day; Children's Day; Women's Day; New Year's Day; Christmas Day; festival则加the如：the Spring Festival; the Lantern Festival; 但前面有形容词，还是可以加的如：a happy New Year's Day；我上述追问问题还是没搞懂都有可能的。加theThe National Day is wonderful. We shall dress the hall up for the National Day.我们要把大厅布置一新过国庆节。不加theIt launched on Oct. 1, National Day inChinaa holidaythat commemorates the 61st anniversary of Communist rule in the country.'I didn't get it at first, ' he says, 'butthis is Christmas, National Day and your birthday all together.