数 词（一）、基数词 注意 eleven, twelve , thirteen, fourteen, eighteen, twenty, thirty, forty, fifty, one hundred/thousand等词的拼写。具体用法如： Lesson Twelve, Class Two, Grade Eight, The No. 45 bus, Channel Five, Room 302, the No.2 middle School, a five-year-old daughter注意1、“前有，后无；前无，后有”即 two hundred books ， hundreds of books2、如 eight-year-old 的词后面要加名词3、“在某人几十岁时”用 in ones +整十的复数 如：in her fifties, in their thirties4、表示“ 多高、多宽、多长、多深，年龄少大、距离多远”时，用“数量+单位+形容词” 如：two months old, twenty meters
