1.Schoolstartatnineo'clock.改错并语法说明2.Heisafive-years-oldboy.
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题目内容：
1.School start at nine o'clock.改错并语法说明 2.He is a five-years-old boy.
优质解答
1.School starts at nine o'clock.School 是单数形式,后面的动词start要加s
2.He is a five-year-old boy.five-year-old 是个定语,year不需要加s
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