nine of + plural noun
用于说明某一确定范围内的数量，后接带限定词或明确的复数名词、代词。
Nine of the twelve players were rested before the final.
十二名球员中有九人在决赛前得到了休息。
基数,八加一的和
the number nine; the cardinal number that is the sum of eight and one
基数,八加一的和
the cardinal number that is the sum of eight and one
If you add 8 and 1, you get 9.
如果把8和1相加，你会得到9。
用法提示：“9”在这里作名词，表示八加一所得的数字九。
My little sister can count to 9 now.
我妹妹现在能数到9了。
用法提示：“9”作介词to的宾语，是名词，指数字九。
The number 9 is my lucky number.
数字9是我的幸运数字。
用法提示：句中“9”作名词，与number同指，表示基数九。
用于说明某一确定范围内的数量，后接带限定词或明确的复数名词、代词。
Nine of the twelve players were rested before the final.
十二名球员中有九人在决赛前得到了休息。
表示比例，也可说 nine in ten，多用于调查、统计类语境。
Nine out of ten customers said they would come back.
十位顾客中有九位表示他们会再来。
固定说法，意思是“十有八九”，用来表示某事几乎总是如此，通常置于句首并加逗号。
Nine times out of ten, the train is late on Monday mornings.
周一早上火车十有八九会晚点。
grammar · medium
易错句子She has a nine-years-old son.
正确表达She has a nine-year-old son.
复合形容词放在名词前作定语时，中间的名词要用单数并加连字符，写成 nine-year-old，不能保留复数 -s；复数形式 years 只出现在作表语的句型里，如 Her son is nine years old.
grammar · medium
易错句子There are nine hundreds students in the hall.
正确表达There are nine hundred students in the hall.
hundred、thousand、million 前面有具体数字时要用单数，词尾不加 -s；只有表示不确切的数量时才用复数加 of，如 hundreds of students（成百上千的学生）。
grammar · medium
易错句子This is my nine time to visit Beijing.
正确表达This is my ninth time to visit Beijing.
表示“第几次”这样的次序要用序数词 ninth；nine 是基数词，只用来计数，不能修饰 time 表示顺序。
ninth 是序数词，表示顺序上的“第九”，通常前面加 the，如 the ninth of May、on the ninth floor；9 是基数词，回答“多少”，用于计数和数量。表示日期、名次、楼层顺序时要用 ninth，不能用 9 的位置去代替。
nineteen 表示 19，虽然以 nine 开头，但多出 -teen 后缀并重读该后缀，指“十几”；9 只表示九个。听写或口语中容易把 nineteen 误听、误写成 9，注意结尾的 -teen。
ninety 表示 90，由 nine 加 -ty 构成，指整十的数量，与 9 相差十倍；9 只是九个。书写时注意 ninety 不含第二个 e，且重音在第一个音节。
ordinal number; noun
number
number
ordinal number; noun
adjective; adverb
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