she is eight years old为什么不是she is eight-year-old

云淡风轻侠 1年前已收到3个回答举报

共回答了18个问题采纳率：77.8% 举报

she is eight years old--------因为eight years old只能做表语,后面不加名词.
但是：she is an eight-year-old girl 就对了,因为eight-year-old（做定语）后面必须加个名词,这里是可数名词单数.

1年前

taoxd125 幼苗

共回答了3个问题举报

She is eight years old ,或者也可以she is an eight-year-girl

1年前

luotao9321 幼苗

共回答了204个问题举报

she is eight years old
eight-year-old 中间加有连字符就变成了形容词
所以我们可以把句子改为
she is an eight-year-old girl

1年前

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