He is a ten years old boy.或He is a ten-year-old boy.He is a boy whose age is ten.（该句为定语从句）望采纳，谢谢(^_^)Y

Hewww.rixia.cc is a ten-year-old boy.
He is a boy of ten years old.

他是一个十岁的男孩
He is a ten-year-old boy

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把一个本来用短语表达的内容用连字符-连接,名词不用复数形式,可构成形容词：ten-year-old
ten-day ,时间还可以用所有格形式ten minutes'
a ten-day holiday=a ten days' holiday
:ten minutes'walk=:ten- minute walk
十米远的房子 ten-metre-away house
表示长、宽、高、远等通常采用第一种方式

Jack is ten years old boy

Jack is a ten-year-old boy.

jack is a ten year old boy

I am an eight-year-old English boy.

• stronger planning capacity:
Nearly two years of planning experience, strong creative thinking, have been involved in electronic equipment, multimedia products such as the planning platform.
• comprehensive analysis capabilities:
Comprehensive analysis of nearly 30 investment projects, involving new energy, environmental protection, hi-tech new technology.
• good organization and coordination capacity:
In school, the school Fraternal organizations, Moot, and other activities; work, coordination of enterprises and supplier relations.

Project experience
First, analysis of investment projects
Projects involving new energy, environmental protection, new technology.
1, the size of the market research, industry competition, technology, the company's financial position of the necessary investment information.
2, comprehensive analysis, project feasibility analysis report writing.
Second, video surveillance system integration
Remote video surveillance system, including the original system integration, the new system in two parts.
1, early market research, analysis of competitors.
2, in the design of system integration programme.
3, research systemjqQwwes and equipment, the associated suppliers.
4, to participate in tenders and business writing technical bids.
Third, product planning
Participating site, electronic equipment, multimedia products such as the planning platform.
1, early market resejqQwwearch, analysis of competitors.
2, for product features and content of planning.
3, to participate in the programme of discussions and the final assessment.
Fourth, RFID personnel Positioning System Integration
Application of RFID technology to achieve the targeted personnel
1, the market research the status quo, industry competition.
2, the design of RFID technology programmes.
3, RFID systems and research equipment, the associated suppliers.
4, writing project reports.

I'm an eight-year-old English boy.
I'm an eight years old English boy.

I am an eight-year-old boy from England

I'm an eight-year-old British boy

This is an eight-year-old boy.
或This is a boy who is eight years old.

this is a boy who is eight years old.

this is a eight-year-old boy.

this is a boy at the age of eight.

This is an eight-year-old young boy.

This is a eight years old boy.

this is a eight-year-old boy eight-year-old 是形容词八岁大的 一中构词法 注意year是单数

He is a eight years old boy.