8 years

I am eight.I am eight years old.最贴切的，这两种。

He is only an 8 years old boy and knows a lot about computer.

没错，八岁英语表达是eight years old，但问题是这里8岁是用作定语，修饰女孩，所以用eight year old，不用复数。

8-year-old 做表语和定语 8 years old 只能作表语,her son is 8 years old 这样可以 .这里面需要定语修饰son 只能使用 her 8-year-old son

大家好，我叫andy,我今年8岁了，我是金坛建昌中心小学二年级（1）班的学生，我喜欢看书和学习英语，我更喜欢我们的英语老师，她叫summer，很漂亮，我们都很喜欢她。Hello, everyone, my name is andy, I am 8 years old, I was Jintan Jianchang Central Primary School Year 2 (1) classes, I...

下面的都是正确的表示年龄的方法。He is eight．He is eight years old．He is a eight-year-old boy．He is aged eight．He is at age eight．He is at the age of eight．He is eight years of age．a boy of 8 years old 是对的，例句，I think a boy of 8 years old can't ...

It's several years since + 句子 或者 It has been several years since + 句子 例如我学英语八年了：It's 8 years since I began to learn English.It has been 8 years since I began to learn English.

2、8的英语是eight，音标是eit双语例句1We average 8 hours work a day我们每天平均工作8小时2My father left smoking for 8 years我父亲戒烟有8年了。3、23twentythree 35thirtyfive 这种几十几的数字英文写法就是前面是几十后面就是个位数，中间用连字符连接即可。4、八是eight 发“A特”的音 ...

When he was eight (years old),At the age of eight,.../At age eight,...As he was eight (years old),如in one's fiftieth 表示在某人五十几岁时