6.在含有“day”节假日前。在中国传统节假日一般有the

　　New Year Day, May Day,  the Spring Festival,  the Dragon Boat Festival,the Mid-autumn Festival,  the Double Ninth Festival,  the Lantern Festival

　　7．用作称呼或表示独一无二头衔、职称等做表语、不足语、同位语时以及称呼。

　　Mr Liu is Chairman of our club.

　　Go there, boy.

　　What shall I do next, Mother

　　In 1860, Lincoln was elected President of the United States.

　　8. 表示季节、月份、周日的名词前；但季节等被限定定语修饰时，用定冠词。星期前加不定冠词表示“某一个…”。

　　In the spring of 2006,  a Tuesday in September

　　9. 在球类、棋类、学科等表运动的名词前和三餐前。

　　What did you have for breakfast

　　Do you like mathematics

　　She is fond of playing basketball.

　　但在breakfast, lunch, supper前通常有描绘性形容词等修饰时，要加不定冠词。

　　He had a wonderful supper.

　　10.复数名词表示一类人或物时。

　　Horses are useful animals.

　　11. 当bike, car, taxi, bus, train, boat, ship, plane等与介词by连用时，表示一种交通手段时，不用冠词。

　　Did you come back by plane or by train

　　但也可用介词in, on等或与动词搭配。这时名词前要有修饰语。

　　come in a car,   take a bus,    on the train

　　还有by water, by land, by sea, by air也可表示交通手段。

　　12. turn, go 表示“变成”, 其后接名词时。