eighteen + 复数名词
数词修饰可数名词时，名词用复数形式。
There are eighteen students in the classroom.
教室里有十八名学生。
比十七多一个
比十七多一个
being one more than seventeen
There are eighteen students in our class.
我们班有十八个学生。
用法提示：eighteen 在这里作定语修饰 students，表示数量“十八”。
She bought eighteen apples at the market.
她在市场上买了十八个苹果。
用法提示：eighteen 修饰 apples，作定语表示数量“十八”。
I have lived here for eighteen years.
我在这里住了十八年。
用法提示：eighteen 修饰 years，作定语表示时间长度“十八”。
数词修饰可数名词时，名词用复数形式。
There are eighteen students in the classroom.
教室里有十八名学生。
表示年龄时可用 be eighteen 或 be eighteen years old，后者更完整。
My brother is eighteen years old.
我弟弟十八岁。
at eighteen 意为“在十八岁时”，常与过去时连用。
She moved to London at eighteen.
她十八岁时搬到了伦敦。
grammar · medium
易错句子She is a eighteen-year-old student.
正确表达She is an eighteen-year-old student.
eighteen 的读音以元音音素 /eɪ/ 开头，不定冠词要用 an，而不是 a。汉语没有冠词，学习者容易忽略这一点。合成形容词 eighteen-year-old 作定语时，前面的冠词同样遵循这一规则。
grammar · medium
易错句子We celebrated my eighteen birthday last week.
正确表达We celebrated my eighteenth birthday last week.
表示“第十八个生日”要用序数词 eighteenth，不能用基数词 eighteen。汉语说“十八岁生日”时数词形式不变，学习者往往直接把 eighteen 搬过来，忘了英语在表示顺序、第几次时须用序数词。
grammar · medium
易错句子My sister is eighty years old.
正确表达My sister is eighteen years old.
eighteen 是“十八”，eighty 是“八十”，两者不能混用：-teen 结尾表示“十几”，-ty 结尾表示“几十”。要表达“十八岁”必须用 eighteen。
十八岁
My sister is eighteen years old.
我妹妹十八岁。
十八个月
The project lasted eighteen months.
这个项目持续了十八个月。
百分之十八
The tax rate is eighteen percent.
税率是百分之十八。
十八洞（高尔夫球场）
We played eighteen holes of golf.
我们打了十八洞高尔夫。
十八英寸
The screen is eighteen inches wide.
屏幕宽十八英寸。
发长 /iː/ 音 (如 see, free)
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十八岁的
She has an eighteen-year-old son.
她有一个十八岁的儿子。