初三英语变成形容词时要不要加s例1Sixteen-year-olds shouldn't be allowed to work at night.例2He is a six-year-old boy.到底什么时候要加啊?

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初三英语变成形容词时要不要加s例1Sixteen-year-oldsshouldn''tbeallowedtoworkatnight.例2Heisasix-year-oldboy.到底什么时候要加啊?初

初三英语变成形容词时要不要加s例1Sixteen-year-olds shouldn't be allowed to work at night.例2He is a six-year-old boy.到底什么时候要加啊?
初三英语变成形容词时要不要加s例1Sixteen-year-olds shouldn't be allowed to work at night.例2He is a six-year-old boy.到底什么时候要加啊?

初三英语变成形容词时要不要加s例1Sixteen-year-olds shouldn't be allowed to work at night.例2He is a six-year-old boy.到底什么时候要加啊?
这里首先你要区别six-year-old在句子里面是担当什么的,
你说的第一句里面,它是作为主语,所以是名词形式,表示6岁的那些孩子,所以可以加s
但是第二句里是作为形容词来用,修饰boy,意思是一个6岁的男孩子,所以不能加s

你这个是初三英语上里面的吧
书上有个例子是 十六岁的青少年应被允许打耳洞
强调一类人的时候加S
说一多少岁的 不加S